单项选择题

If it ______ rain tomorrow, we'll go to the zoo.

A．doesn't
B．Won't
C．isn't
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单项选择题
They have gone to Xi' an. ______ you ever _______ there before
A．Have... been
B．Have... gone
C．Do... go
单项选择题
Don't stop and go on ______.
A．read
B．to read
C．reading
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