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
Not to show ill-feeling about his proposal, I ______ followed him down again in four or five minutes.
A．nevertheless
B．although
C．even though
D．yet
单项选择题
Those were the graduate students ______ to do the research work in the lab.
A．to whom it was their responsibility
B．of whom the function was
C．whose responsibility was
D．of whom with the responsibility
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