单项选择题

If he had left in time for the last bus, ______.

A．he shouldn"t have missed it
B．he ought not have missed it
C．he mustn"t have missed it
D．he couldn"t have missed it
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单项选择题
Mary wishes that she ______ law instead of history when she was in college.
A．had studied
B．has studied
C．studies
D．studied
单项选择题
Just as relaxation is an important part of our lives, ______ stress.
A．so is
B．as it is
C．and so is
D．the same is
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