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

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单项选择题
If John （） tomorrow, he will work in the garden.

A．comes
B．came
C．is coming
D．will come
单项选择题
Some animals can （） in the desert on very little water.

A．survive
B．starve
C．relieve
D．routine
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