When I try to understand _______ that prevents so many Americans from being as happy as one might expect, it seems to me that there are two causes.?

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

C　


解析:

　考查強(qiáng)調(diào)句型和賓語(yǔ)從句。本題的主句是it seems to me that,在when引導(dǎo)的時(shí)間狀語(yǔ)從句中含有what引導(dǎo)的賓語(yǔ)從句,且賓語(yǔ)從句為強(qiáng)調(diào)句型。

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