单项选择题


A．started
B．conducted
C．replaced
D．proposed
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单项选择题
It ______months since we ______ in Shanghai.
A．has been...were
B．is ...are
C．was...had been
D．had been...have been
单项选择题
A．at a lossB．at lastC．in groupD．on the occasion
A．at a loss
B．at last
C．in group
D．on the occasion
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