Experts are trying to work out a plan to deal with the problems caused by global warming _________ it is too late.A．ifB．before C．whenD．until-高中英语-n多题

◎ 题干

Experts are trying to work out a plan to deal with the problems caused by global warming _________ it is too late.

A．if

B．before

C．when

D．until

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◎ 解析

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◎ 知识点

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