单项选择题

You'd better take an extra 10 pounds（）you need it for taxi.

A．unless
B．in case
C．in spite of
D．though

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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

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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