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We plan to increase the output of the machine ()7.4 percent this year.

A. at
B. in
C. by
D. with

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单项选择题

()in Beijing for more than twenty years, he knows the city very well.

A. Living
B. Lived
C. Having lived
D. To live

单项选择题

() more time, the scientists will be able to work out a good solution to the problem.

A. Given
B. Giving
C. To give
D. Be given

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