【題目】Don't throw waste paper everywhere.It's our duty to keep our school .
A.clean
B.cleaned
C.cleaning
D.cleans

【答案】A
【解析】句意:不要到處扔廢紙,保持學(xué)校清潔是我們的責(zé)任。keep +賓語+形容詞 使某物保持某種狀態(tài)。clean adj干凈的;清潔的;vt打掃。故選A。

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