单项选择题

He'd better resign from his post, ______

A．wouldn't he
B．shouldn't he
C．couldn't he
D．hadn't he
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单项选择题
The construction of the second-ring viaduct has been ______ for three months.
A．on the way
B．under way
C．at the way
D．to the way
单项选择题
The strong storm ______ all the power lines in this region.
A．knock over
B．knock out
C．knock at
D．knock up
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