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

We haven't enough books for (); some of you will have to share.

A．somebody
B．anybody
C．everybody
D．nobody

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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