I just don't understand_____________ that prevents so many Americans from
being as happy as one might expect.
A．why it doesB．what it does
C．what it isD．why it is
C
本題是賓語(yǔ)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(yǔ)中疑問(wèn)代詞或副詞需放句首。
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