单项选择题

I've got a very （） schedule today so I can't see you until tomorrow.

A．serious
B．big
C．tough
D．tight

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单项选择题

They （） us since five o'clock this morning until now.

A．are helping
B．help
C．have helped
D．have been helping

单项选择题

If John （） tomorrow, he will work in the garden.

A．comes
B．came
C．is coming
D．will come

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