问题
选择题
Scientists from different countries are working together to _____ a good way to solve the problem. [ ]
A. keep up with
B. meet up with
C. catch up with
D. come up with
答案
答案：D
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Scientists from different countries are working together to _____ a good way to solve the problem. [ ]
A. keep up with
B. meet up with
C. catch up with
D. come up with
答案：D