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I just don't understand_______ that prevents so many Americans from being as happy as one might expect.

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

C


解析:

本题是宾语从句中的强调句使用。可以将原句恢复:“It is what that prevents  so many Americans…”但是英语中疑问代词或副词需放句首。

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