单项选择题


A．If
B．With
C．As
D．Had
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单项选择题
A．was takingB．had takenC．would takeD．would have taken
A．was taking
B．had taken
C．would take
D．would have taken
单项选择题
A．thenB．whenC．soD．if
A．then
B．when
C．so
D．if
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