单项选择题

There’s little chance that mankind would()a nuclear war.

A. retain
B. endure
C. maintain
D. survive

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单项选择题
Everyone is working harder, and living a happier life now, ()

A. isn’t one         
B. aren’t we
C. isn’t it         
D. aren’t they
单项选择题
Sorry, I didn’t know ()Dr. Smith has already returned from his holiday. I’ll go and see him in a minute

A. that
B. when
C. whether
D. if
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