单项选择题

A．diagram
B．curve
C．line
D．circle
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单项选择题
A．IfB．WithC．AsD．Had
A．If
B．With
C．As
D．Had
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
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