单项选择题

You ______ him so closely; you should have kept your distance.

A．shouldn’’t follow
B．mustn’’t follow
C．couldn’’t have been following
D．shouldn’’t have been following
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单项选择题
The car wants ______.
A．to maintain
B．to be maintained
C．to maintaining
D．maintaining
单项选择题
Had he worked harder, he _______ the exams.
A．must have got through
B．would have got through
C．would get through
D．could get through
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