【題目】 It’s our duty ________our city clean and beautiful.

Yes. We should do something for it.

A. to keep B. keep C. keeping D. keeps

【答案】A

【解析】

試題分析:句意:---讓我們的城市保持干凈美麗是我們的義務(wù)---是的,我們應(yīng)該為這個(gè)做些什么。此題考查固定句式Its ones duty to do sth做某事是某人的義務(wù)。根據(jù)句意,應(yīng)選A

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