It is widely believed that the pull of gravity on a falling raindrop changes______round shape into a teardrop shape.

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问题 It is widely believed that the pull of gravity on a falling raindrop changes______round shape into a teardrop shape.

选项 A、of the drop
B、the drop’ s
C、drop of
D、drops the

答案B

解析 It是形式主语。“that…”引导的是主语从句。主语从句的滑语是"changes…into…”“把……变成……”。其中“…into…”的前后应是对应的平行结构。很明显A和D都不行，不能把“changes"误作名词。C改变了“…into…”的平行关系。只有B既能与前边的动词"changes"衔接，又能保持“…into…”的平行关系。

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