【題目】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】

試題分析:句中 it 是形式主語 ,真正主語是后面 that 引導(dǎo)的主從,that在主語從句中不充當(dāng)成分,只起引導(dǎo)作用。第二空的連詞 while然而,表示上下文轉(zhuǎn)折關(guān)系。As不能表示上下文的轉(zhuǎn)折關(guān)系。句:讓一些科學(xué)家困惑的是一些哺乳動物生出下一代,而另外一些卻產(chǎn)卵。故選 A

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