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(2014·湖南六校联考)I know it’s normal for such a thing to happen，but we________it if we’d been more careful.
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A
need have avoided　
B
could have avoided
C
will have avoided　
D
had avoided
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 Mr. Li, a man calling himself Smith wants to see you. ________ he come in?
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Should
B
Can
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Shall
D
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The boss requested that he _____ there to work.
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was sent
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be sent
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should be
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were
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had been
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was
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A
may stay up
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could stay up
C
should have stayed up
D
must have stayed up
My father________hungry when he was young.
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A
would go
B
was going
C
used to go
D
had gone