问题
选择题
We believe scientists will ______ a way to solve the problem of air pollution. [ ]
A. set off
B. put off
C. come up with
D. catch up with
答案
答案：C
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We believe scientists will ______ a way to solve the problem of air pollution. [ ]
A. set off
B. put off
C. come up with
D. catch up with
答案：C