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
Sometimes, changing our way of thinking, ______.
A．the problems become simpler and clearer
B．we will find the problems simpler and clearer
C．the simpler and clearer the problems will become
D．the problems will become simple and easy
单项选择题
______, he realized he made the right decision.
A．Before long
B．Long before
C．After
D．Before
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