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When I try to understand ________ that prevents so many children from being happy, there seem to be three causes.

A.why it is B.what it does C.why it does D.what it is

D

解析试题分析:句意:当我试图理解是什么阻止这么多的孩子快乐,似乎有三个原因。这里使用了强调句的特殊问句,因为that后面缺少主语,所以用疑问词what,又因为这个强调句的特殊问句是做understand的宾语从句,所以语序要变成陈述句语序。所以选D。
考点:考查强调句的特殊问句和宾语从句

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