单项选择题

Perhaps it will be a long while ______ Donald comes back from New York. Don't wait for him.

A．when
B．that
C．since
D．before
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单项选择题
— Doctor, I can't come to see you next Monday.— ______. Come and see me whenever you have time.
A．Never mind
B．Come on
C．Go ahead
D．Not at all
单项选择题
The police are anxious to hear from anyone who ______ know the missing woman.
A．can
B．may
C．must
D．will
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