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Scientists should _____ new ways to solve the pollution problem.

A. catch up with
B. come up with
C. keep up with
D. make up with
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科目：初中英語 來源：0103 期中題 題型：單選題

Scientists should _____ new ways to solve the pollution problem.
[     ]
A. catch up with
B. come up with
C. keep up with
D. make up with

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