We believe scientists will _____ a way to solve the problem of airpollution.

A. set off
B. put off
C. come up with
D. catch up with
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科目：初中英語 來源：專項題 題型：單選題

We believe scientists will _____ a way to solve the problem of airpollution.
[     ]
A. set off
B. put off
C. come up with
D. catch up with

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