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atulmangal
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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 given is Op A, i have one doubt, see below
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.
The green i believe is the subject of the verb as indicated in red color..."fuel cell" is singular, is the use of "have become" is correct or m missing something????
(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 given is Op A, i have one doubt, see below
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.
The green i believe is the subject of the verb as indicated in red color..."fuel cell" is singular, is the use of "have become" is correct or m missing something????
