单项选择题
______ the PLA men the villagers would not have survived the flood.
A．It had not been for
B．Had it not been for
C．Were it not for
D．Has it not been for
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单项选择题
If law and order ______ not preserved, people will not he able to live a secure life.
A．are
B．were
C．is
D．was
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单项选择题
______ John Adams who in 1775 recommended George Washington to be commander in chief of the Continental Anny.
A．It was
B．That was
C．Although
D．When
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