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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单项选择题
It was last summer ______ we were invited to his birthday party.
[A] that
[B] when
[C] than
[D] who
单项选择题
Waving one's arms can be accepted as ______ for help.
[A] to cry
[B] crying
[C] cried
[D] cry
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