单选题：When I try to understand （　　） that prevents so many American

题目分类：公共英语四级
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 as happy as one might expect, it seems tome 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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No matter how frequently （　　）, the works of Beethoven always

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分类：公共英语四级题型：单选题

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All （　　） is a continuous supply of the basic necessities of

All （　　） is a continuous supply of the basic necessities of life.A．what is neede

分类：公共英语四级题型：单选题

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At last she left her house and got to the airport, only（　　）t

At last she left her house and got to the airport, only（　　）the plane flying away

分类：公共英语四级题型：单选题

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分类：公共英语四级题型：单选题

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They are going to have the serviceman（　　） an electric fan in

They are going to have the serviceman（　　） an electric fan in the office tomorrow

分类：公共英语四级题型：单选题

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