单项选择题

For so many years, the small town is still ______.

A．nonchangeable
B．unchangeable
C．unchangble
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单项选择题
I've already ______ for the dinner. Shall we go now
A．payed
B．paid
C．paided
单项选择题
It ______ be Mr. Green. I know he went to Shanghai yesterday.
A．mustn't
B．can't
C．may not
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