I try to understand __________ that prevents so many Chinese from being as happy as one might expect_刷题宝

题干

I try to understand __________ that prevents so many Chinese from being as happy as one might expect.

A：why is it

B：what is it

C：why it i

D：what it i

上一题下一题 0.0难度选择题更新时间:2015-05-09 05:45:37

答案(点此获取答案解析）

D

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