Knewton..NASA SC

[prachich1987]

In 1839, experiments with hydrogen and water performed by Sir William Grove led to the development of fuel cells, and though the use of these cells was originally considered overly costly, today the fuel cell, which can efficiently power everything from large generating plants and NASA rockets to small portable communication devices, seems to have become a popular and promising source of power.


(A) large generating plants and NASA rockets to small portable communication devices, seems to have

(B) large generating plants, NASA rockets, and small portable communication devices, seems having

(C) large generating plants, NASA rockets, and small portable communication devices, seems that it has

(D) large generating plants and NASA rockets to small portable communication devices, seems that it has

(E) large generating plants and NASA rockets as well as small portable communication devices, seems to have



The OA is A.
But "seems to have"--is this a correct usage?It refers to fuel cell which is singular.

[kapur.arnav]

In 1839, experiments with hydrogen and water performed by Sir William Grove led to the development of fuel cells, and though the use of these cells was originally considered overly costly, today the fuel cell, which can efficiently power everything from large generating plants and NASA rockets to small portable communication devices, seems to have become a popular and promising source of power.


(A) large generating plants and NASA rockets to small portable communication devices, seems to have

(B) large generating plants, NASA rockets, and small portable communication devices, seems having

(C) large generating plants, NASA rockets, and small portable communication devices, seems that it has

(D) large generating plants and NASA rockets to small portable communication devices, seems that it has

(E) large generating plants and NASA rockets as well as small portable communication devices, seems to have



The OA is A.
But "seems to have"--is this a correct usage?It refers to fuel cell which is singular.

yes fuel cell refers to seems which is singular and correct... have refers to 'become a popular and promising source of power' which is plural... read like this: the fuel seems to have/has become a popular and promising source of power... has is not the correct usage here clearly...

[prachich1987]

In 1839, experiments with hydrogen and water performed by Sir William Grove led to the development of fuel cells, and though the use of these cells was originally considered overly costly, today the fuel cell, which can efficiently power everything from large generating plants and NASA rockets to small portable communication devices, seems to have become a popular and promising source of power.


(A) large generating plants and NASA rockets to small portable communication devices, seems to have

(B) large generating plants, NASA rockets, and small portable communication devices, seems having

(C) large generating plants, NASA rockets, and small portable communication devices, seems that it has

(D) large generating plants and NASA rockets to small portable communication devices, seems that it has

(E) large generating plants and NASA rockets as well as small portable communication devices, seems to have



The OA is A.
But "seems to have"--is this a correct usage?It refers to fuel cell which is singular.

yes fuel cell refers to seems which is singular and correct... have refers to 'become a popular and promising source of power' which is plural... read like this: the fuel seems to have/has become a popular and promising source of power... has is not the correct usage here clearly...

I think here "have" refers only to fuel cell & not to "become popular"

1)the fuel seems to have become a popular and promising source of power
2)the fuel seems to has become a popular and promising source of power

I understand that the first one is right as it sounds good when I hear
But I am really unable to understand why 'has' doesn't fit here though 'cell' is singular