单项选择题

Drop in for a coffee tomorrow, if you ______ too busy.

A．aren't
B．won't be
C．wouldn't be
D．don't be
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单项选择题
No one could tell us anything about the ______ stranger.
A．conscious
B．mysterious
C．serious
D．previous
单项选择题
Mary is having a holiday for once. Oh, good, she ______ ever has a holiday, does she
A．doesn't
B．does
C．won't
D．Will
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