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

A. Exposing B. To expose

C. Exposed D. Being exposed

D

【解析】

試題分析：考查非謂語動詞。句意：小心！頻繁暴露于霧霾中會對健康造成很大的傷害。be exposed to sth暴露于，exposed在此是形容詞化的過去分詞，相當于形容詞，排除A；助動詞does前面是主語部分，常用動名詞作主語，故選D。

考點：考查非謂語動詞

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