单项选择题
When Jack arrived he learned Mary ______ for almost an hour.
A．had gone
B．had set off
C．had left
D．had been away
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单项选择题
Completely new situation will ______ when the new examination system comes into existence.
A．rise
B．raise
C．arouse
D．arise
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单项选择题
A friend of mine returned to his house after a holiday, only to find that it ______.
A．to be broken into
B．had broken into
C．was broken into
D．had been broken into
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