单项选择题


A．was coming on
B．was going on
C．was putting on
D．was taking on
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单项选择题
A．differenceB．mistakeC．problemD．company
A．difference
B．mistake
C．problem
D．company
单项选择题
A．beforeB．afterC．whileD．because
A．before
B．after
C．while
D．because
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