WhenItrytounderstandthatpreven

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更新 2022-09-03
科目英语
题型单选题
难度较易
浏览 1630

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

A．why it does

B．what it does

C．what it is

D．why it is

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