问题
选择题
Scientists will have to _____ new ways to solve the water problem. [ ]
A. catch up with
B. keep up with
C. come up with
D. make up with
答案
答案：C
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Scientists will have to _____ new ways to solve the water problem. [ ]
A. catch up with
B. keep up with
C. come up with
D. make up with
答案：C