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Take care! _______ to frequent smog does great harm to your health.

A. Exposing B. To expose

C. Exposed D. Being exposed

D

【解析】

试题分析:考查非谓语动词。句意:小心!频繁暴露于雾霾中会对健康造成很大的伤害。be exposed to sth暴露于,exposed在此是形容词化的过去分词,相当于形容词,排除A;助动词does前面是主语部分,常用动名词作主语,故选D。

考点:考查非谓语动词

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