单项选择题

Mary wants to visit her uncle's. She()for the bus for two hours but it has not come yet.

A．has been waiting
B．is waiting
C．has waited
D．will be waiting

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单项选择题

Tom isn't here. He () for almost an hour.

A．has gone
B．has been away
C．has left
D．has set off

单项选择题

You()be tired, for you've only been working for an hour.

A．must not
B．won't
C．can't
D．may not

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