18.-We must keep our classroom        every day.
-Yes,Miss Gao.( 。
A.cleanB.cleanedC.to cleanD.cleaning

分析 --我們必須每天保持教室清潔.
--是的,高老師.

解答 答案:A.
本題考查非謂語動詞的用法.根據(jù)語境推測句意是"我們必須每天保持教室清潔.",結(jié)合設(shè)空處前面的 keep判斷此題考查句式"keep+賓語+形容詞(賓語補(bǔ)足語)"; 所以選A.

點評 本題考查非謂語動詞的用法,抓住句中的關(guān)鍵詞并聯(lián)系相關(guān)的語法知識可得出正確的答案.平時注意對此類短語或句式用法的總結(jié)與歸納.

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