We believe scientists will________a way ...

We believe scientists will________a way to solve the air pollution．

A．set off

B．put off

C．come up with

D．catch up with

C 【解析】句意：我们相信科学家们会想出一个办法来解决空气污染的。set off意为“动身，出发”；put off意为“推迟，拖延”；come up with意为“想出，提出”；catch up with意为“赶上”。

考点分析：

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