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【题目】It puzzles the scientists _____ some mammals produce their young _____ others lay eggs.

A.that; while B.what; while

C.that; as D.what; as

【答案】A

【解析】

试题分析:句中 it 是形式主语 ,真正主语是后面 that 引导的主从,that在主语从句中不充当成分,只起引导作用。第二空的连词 while然而,表示上下文转折关系。As不能表示上下文的转折关系。句:让一些科学家困惑的是一些哺乳动物生出下一代,而另外一些却产卵。故选 A

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