When I try to understand ____ that prevents so many Americans from being as happ

题干

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 does it

B．what does it

C．what it is

D．why it is

上一题下一题 0.64难度单项选择更新时间:2013-05-08 01:20:37

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