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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单项选择题
（）in my brother's position, I would have hung up the phone in the middle of the conversalion.

A．Had I have been
B．Had I been
C．Have I been
D．If I been
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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