I just don't understand_______ that prevents so many Americans from being as happy as one might expect.
A．why it doesB．what it doesC．what it isD．why it is
C
 本題是賓語從句中的強(qiáng)調(diào)句使用�？梢詫⒃浠謴�(fù)：“It is what that prevents  so many Americans…”但是英語中疑問代詞或副詞需放句首。
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