单项选择题

It was not until she arrived in class ______ realized she had forgotten her book.

A．and she
B．when she
C．she
D．that she
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单项选择题
It is time the government ______ the law into effect.
A．is putting
B．put
C．puts
D．will put
单项选择题
Had he worked harder, he ______ the exams.
A．must have got through
B．could get through
C．would get through
D．would have got through
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