【題目】--It’s our duty______our city clean and beautiful.-Yes.We should do something for it

A. to keep B. keep C. keeps

【答案】A

【解析】

句意:-保持我們的城市干凈和美麗是我們的職責(zé)。-是的,我們應(yīng)該為此做點事。to keep動詞不定式;keep保持,動詞原形;keeps第三人稱單數(shù)形式。這句話中使用了句型It is one’s duty to do sth.做某事是某人的職責(zé),故這里用動詞不定式,選A。

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