单项选择题

A new system of quality control was brought in to overcome the defects in the firm's products.

A．invested
B．introduced
C．installed
D．insisted
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The workers finally called off the strike.
A．put off
B．ended
C．cancelled
D．participated in
单项选择题
In judging our work you should take into consideration the fact that we have been very busy re cently.
A．thought
B．mind
C．account
D．memory
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