单项选择题

Don't be careless again, ______

A．will you
B．are you
C．did you
D．do you
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单项选择题
It is over two years since my brother ______the army.
A．joins
B．joined
C．has joined
D．had joined
单项选择题
We ______our dinner when a policeman came to the door.
A．just had
B．have just had
C．just have had
D．had just had
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