单项选择题

You had one of your teeth pulled out yesterday, ______

A．had you
B．hadn't you
C．did you
D．didn't you
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单项选择题
I will talk to the children ______ .
A．one and then the other
B．first one then the next
C．one by one
D．in singles
单项选择题
—Must we do it now—No, you ______ .
A．won't
B．needn't
C．can't
D．don't
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