When I try to understand ________ that prevents so many children from being happy, there seem to be three causes.
A．why it isB．what it does C．why it doesD．what it is
D

試題分析：句意：當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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