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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

C

【解析】

试题分析:句意:我认为科学家会想出一种解决空气污染这一问题的方法。A. set off启程;B. put off 推迟; C. come up with想出······;D. catch up with追上······,结合句意,故选C。

考点:考查动词短语辨析。

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