单项选择题

How these big stones were moved to the mountain tops remains a （）, that is, nobody knows how.

A. mystery
B. possibility
C. responsibility
D. faith

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单项选择题
To improve efficiency the factory （） most of its workers with robots.

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