单项选择题

I want you to come to the party but ______ you don't want to come, you don't have to.

A．while
B．before
C．unless
D．if
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单项选择题
By the time I come back from my holidays, you ______ your paper.
A．will have finished
B．will be finished
C．would finish
D．have finished
单项选择题
While Sally was in Paris, she ______ a lot of French.
A．got about
B．took in
C．put away
D．picked up
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