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Airpollutionisgettingmoreandmoreserious，sowemusttakeact...

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问题详情：

Airpollutionisgettingmoreandmoreserious，sowemusttakeact...

Air pollution is getting more and more serious，so we must take action________it is too late.

A．before　 B．after

C．until 　 D．when

【回答】

A

知识点：连词

题型：选择题

Tags：sowemusttakeact

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