【題目】It is our duty ____ the environment.

A. to protect B. protecting

C. protected D. Protect

【答案】A

【解析】

試題分析:句意:保護(hù)好環(huán)境是我們的責(zé)任。It is our duty to do sth.表示做某事是某人的職責(zé)。根據(jù)題意,故選A。

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