单项选择题

They had wanted to help but ______ get there in time.

A．can't
B．couldn't
C．don't
D．won't
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单项选择题
_______ is standing at the corner of the street.
A．A police
B．The police
C．Police
D．A policeman
单项选择题
Dr Black comes from New York or Chicago, I can’t remember ______.
A．which
B．where
C．that
D．what
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