单选题：When I try to understand_______that prevents so many Americ

题目分类：成人英语三级
题目类型：单选题
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题目内容：

When I try to understand_______that prevents so many Americans from being SO 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

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I cannot find my umbrella．I must have________ it on the bus．

I cannot find my umbrella．I must have________ it on the bus． A．lost B．forgotten

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