单项选择题


A．as
B．after
C．until
D．when
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单项选择题
A．worked onB．worked atC．worked upD．worked out
A．worked on
B．worked at
C．worked up
D．worked out
单项选择题
A．followedB．attendedC．accompaniedD．ensued
A．followed
B．attended
C．accompanied
D．ensued
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