单项选择题

To improve efficiency the factory （） most of its workers with robots.

A. operated
B. replaced
C. contributed
D. accomplished

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单项选择题
（） by his friend for his mistake, Jim felt very unhappy.

A. Criticizing
B. To criticize
C. Criticized
D. Having criticized
单项选择题
Our sports meet is planned to take place （） Saturday morning.

A. in
B. at
C. on
D. of
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