() 5. Scientists from different countries are trying to a good way to solve the energy problem. A. keep up with B. come up with C. catch up with D. meet up with 题目和参考答案——青夏教育精英家教网—

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() 5. Scientists from different countries are trying to a good way to solve the energy problem.

A. keep up with B. come up with C. catch up with D. meet up with

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