When I try to understand __________ that prevents so many Americans f-考呗网题库移动版

单选题 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 reasons.

A．why it does
B．what it does
C．what it is
D．why it is

参考答案C

解析:

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单选题 Investigators agreed that passengers on the airliner __________ at the very moment of the crash.

A．ought to die
B．must have died
C．must be dying
D．should have died

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单选题 Justice, as well as the law, __________ that these bandits __________ severely punished.

A．demand.., be
B．demands.., be
C．demand.., are
D．demands.., are

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单选题 __________ from a distance, the island looked like a cloud.

A．Viewing
B．To view
C．Viewed
D．Being viewed

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