prep语法难题讨论(供自己复习及大家讨论,楼主勿删)

james0917

10

The single-family house constructed by the Yana, a Native American people who lived in what is now northern California, was conical in shape, its framework of poles overlaid with slabs of bark, either cedar or pine, and banked with dirt to a height of three to four feet.

	banked with dirt to a height of
	banked with dirt as high as that of
	banked them with dirt to a height of
	was banked with dirt as high as
	was banked with dirt as high as that of

AD区分不来,A正确答案

james0917

11.Although the first pulsar, or rapidly spinning collapsed star, to be sighted was in the summer of 1967 by graduate student Jocelyn Bell, it had not been announced until February, 1968.

	Although the first pulsar, or rapidly spinning collapsed star, to be sighted was in the summer of 1967 by graduate student Jocelyn Bell, it had not been announced until February, 1968.
	Although not announced until February, 1968, in the summer of 1967 graduate student Jocelyn Bell observed the first pulsar, or rapidly spinning collapsed star, to be sighted.
	Although observed by graduate student Jocelyn Bell in the summer of 1967, the discovery of the first sighted pulsar, or rapidly spinning collapsed star, had not been announced before February, 1968.
	The first pulsar, or rapidly spinning collapsed star, to be sighted was observed in the summer of 1967 by graduate student Jocelyn Bell, but the discovery was not announced until February, 1968.
	The first sighted pulsar, or rapidly spinning collapsed star, was not announced until February, 1968, while it was observed in the summer of 1967 by graduate student Jocelyn Bell. D(c,d,e??)

james0917

12.Before scientists learned how to make a synthetic growth hormone, removing it painstakingly in small amounts from the pituitary glands of human cadavers.

	scientists learned how to make a synthetic growth hormone, removing it painstakingly
	scientists had learned about making a synthetic growth hormone, they had to remove it painstakingly
	scientists learned how to synthesize the growth hormone, it had to be painstakingly removed
	learning how to make a synthetic growth hormone, scientists had to remove it painstakingly
	learning how to synthesize the growth hormone, it had to be painstakingly removed by scientists

答案居然是D；请教比较C,D