单项选择题

A driver should concentrate ____________ the road when driving.

A．from
B．in
C．on
D．of
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单项选择题
You haven't done the job ____________ —you'll have to do it again.
A．comprehensively
B．properly
C．consequently
D．regularly
单项选择题
Hurry up! By the time we get to the restaurant, the marriage ceremony ____________ started.
A．shall have
B．will have
C．has
D．must have
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