【題目】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

【答案】D

【解析】試題分析：句意：當(dāng)我試圖理解是什么阻止這么多的孩子快樂，似乎有三個原因。這里使用了強調(diào)句的特殊問句，因為that后面缺少主語，所以用疑問詞what，又因為這個強調(diào)句的特殊問句是做understand的賓語從句，所以語序要變成陳述句語序。所以選D。

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