单项选择题
______ a good beginning is made, the work is half done.
A．As soon as
B．While
C．As
D．Once
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单项选择题
The newspapers reported yesterday several ______ on the boundaries of these two countries.
A．incidents
B．happenings
C．events
D．accidents
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单项选择题
We didn't know his telephone number, otherwise we ______ him.
A．would telephone
B．would have telephoned
C．had telephoned
D．must have telephoned
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