单项选择题

______ he would have passed the important exam.

A．Had he worked hard
B．Did he work hard
C．Were he to work hard
D．If he worked hard
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单项选择题
Mr. Smith said that he did not want to ______ any further responsibilities.
A．take on
B．get on
C．put up
D．look up
单项选择题
We met the old man ______ times on the way home.
A．dozen of
B．dozen
C．dozens
D．dozens of
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