单项选择题

You must explain __ how they succeeded __ the experiment.

A．of us; for
B．at us; at
C．to us; in
D．for us; to
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单项选择题
—I'd like to take a week's holiday.— ______, we're too busy.
A．Don't worry
B．Don't mention it
C．Forget it
D．Pardon me
单项选择题
I often see lights in that empty house. Do you think I ______ report it to the police
A．should
B．may
C．will
D．can
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