单项选择题

When you _________ I am sure you will have less pain.

A．are waking up
B．wake up
C．have been waking up
D．have waken up
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单项选择题
I could recognize that car at a _________.
A．square
B．sight
C．flame
D．glance
单项选择题
I don’t know _________ get his hair cut.
A．why Tom doesn't
B．why does Tom not
C．why Tom not
D．why doesn't Tom
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