单项选择题

They should have gone earlier, ______

A. have they
B. didn't they
G. haven't they
D. shouldn't they
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单项选择题
Light is different ______ sound ______ the way it travels.
A．in, from
B．of, to
C．by, for
D．from, in
单项选择题
I don't think it's any use ______.
A．in you to run away
B．in you running away
C．you to run away
D．your running away
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