单项选择题

At first Tim insisted he was right, but then began to ______.

A．back down
B．follow up
C．drop off
D．break out
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单项选择题
I would never have _______Jim of committing the theft.
A．charged
B．convicted
C．suspected
D．reminded
单项选择题
John, how lazy you are! This work _____three days ago.
A．should have done
B．must have been done
C．should have been done
D． might have done
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