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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单项选择题

Peter is my close friend and I know him well. He sleeps with the windows ______ every day.

[A] close
[B] to close
[C] closing
[D] closed

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

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