Experts are trying to work out a plan to deal with the problems caused by global warming________it is too late.[ ]A. whenB. ifC. beforeD. 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. when
B. if
C. before
D. until

◎ 答案

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◎ 解析

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◎ 知识点

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