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请教几道OG语法
204. In recent years cattle breeders have increasingly used crossbreeding, in part that their steers should acquire certain characteristics and partly because crossbreeding is said to provide hybrid vigor. (A) in part that their steers should acquire certain characteristics (B) in part for the acquisition of certain characteristics in their steers (C) partly because of their steers acquiring certain characteristics (D) partly because certain characteristics should be acquired by their steers (E) partly to acquire certain characteristics in their steers
e is right, but why D is wrong?
205. The peaks of a mountain range, acting like rocks in a streambed, produce ripples in the air flowing over them; the resulting flow pattern, with crests and troughs that remain stationary although the air that forms them is moving rapidly, are known as "standing waves." (A) crests and troughs that remain stationary although the air that forms them is moving rapidly, are (B) crests and troughs that remain stationary although they are formed by rapidly moving air, are (C) crests and troughs that remain stationary although the air that forms them is moving rapidly, is (D) stationary crests and troughs although the air that forms them is moving rapidly, are (E) stationary crests and troughs although they are formed by rapidly moving air, is
C is correct, but why E is wrong?
208. Teratomas are unusual forms of cancer because they are composed of tissues such as tooth and bone not normally found in the organ in which the tumor appears. (A) because they are composed of tissues such as tooth and bone (B) because they are composed of tissues like tooth and bone that are (C) because they are composed of tissues, like tooth and bone, tissues (D) in that their composition, tissues such as tooth and bone, is (E) in that they are composed of tissues such as tooth and bone, tissues E is correct, but why A is wrong?
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