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
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科目：初中英語 來源：同步題 題型：單選題

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

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