单项选择题

Mr. Li ______be in Beijing because I saw him in town only a few minutes ago.

A．isn't able to
B．mustn't
C．may not
D．can't
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单项选择题
There won't be any concert this Saturday evening,______
A．isn't there
B．won't there
C．will there
D．will it be
单项选择题
When he was offered the position, he didn't know ______to accept it or not.
A．whether
B．if
C．what
D．how
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