单项选择题

He ______ it very useful to learn English well.

A．says
B．hopes
C．thinks
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If it ______ rain tomorrow, we'll go to the zoo.
A．doesn't
B．Won't
C．isn't
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They have gone to Xi' an. ______ you ever _______ there before
A．Have... been
B．Have... gone
C．Do... go
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