单项选择题

John（）be in New York because I saw him in town only a few minutes ago.

A．mustn't
B．can't
C．may not
D．isn't able to

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单项选择题
If I had remembered（）the window, the thief would not have got in.

A．to close
B．closing
C．to have closed
D．having closed
单项选择题
If you（）a moment, I'll ask the manager to talk with you about the recent develop ments of the factory.

A．waited
B．are waiting
C．wait
D．have waited
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