单项选择题

Don't get down until the train （）

A．is stopped
B．stopped
C．stops
D．has stopped

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单项选择题

Don't forget to post the letter for me, （）

A．do you
B．will you
C．are you
D．can you

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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