plz explain me the following two questions:
Before scientists learned how to make a synthetic growth hormone, removing it painstakingly in small amounts from the pituitary glands of human cadavers.
(A) scientists learned how to make a synthetic growth hormone, removing it painstakingly
(B) scientists had learned about making a synthetic growth hormone, they had to remove it painstakingly
(C) scientists learned how to synthesize the growth hormone, it had to be painstakingly removed
(D) learning how to make a synthetic growth hormone, scientists had to remove it painstakingly
(E) learning how to synthesize the growth hormone, it had to be painstakingly removed by scientists
ans given is C.... but i think its D...
First discovered more than 30 years ago, Lina's sunbird, a four-and-a-half-inch animal found in the Phillippines and that resembles a hummingbird, has simmering metallic colors on its head; a brilliant orange patch, bordered with red tufts, in the center of its breast; and a red eye.
(A) found in the Phillippines and that resembles
(B) found in the Phillippines and that, resembling
(C) found in the Phillippines and resembling
(D) that is found in the Phillippines and it resembles
(E) that is found in the Phillippines and that, resembling
OA-C . even i chose C because its the shortest but i want to know the basics behind this.
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Before scientists learned how to make a synthetic growth hormone, removing it painstakingly in small amounts from the pituitary glands of human cadavers.
(A) scientists learned how to make a synthetic growth hormone, removing it painstakingly
(B) scientists had learned about making a synthetic growth hormone, they had to remove it painstakingly
(C) scientists learned how to synthesize the growth hormone, it had to be painstakingly removed
(D) learning how to make a synthetic growth hormone, scientists had to remove it painstakingly
(E) learning how to synthesize the growth hormone, it had to be painstakingly removed by scientists
ans given is C.... but i think its D...
First discovered more than 30 years ago, Lina's sunbird, a four-and-a-half-inch animal found in the Phillippines and that resembles a hummingbird, has simmering metallic colors on its head; a brilliant orange patch, bordered with red tufts, in the center of its breast; and a red eye.
(A) found in the Phillippines and that resembles
(B) found in the Phillippines and that, resembling
(C) found in the Phillippines and resembling
(D) that is found in the Phillippines and it resembles
(E) that is found in the Phillippines and that, resembling
OA-C . even i chose C because its the shortest but i want to know the basics behind this.
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