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【题目】It’s not enough ____ only the classroom clean .

A.keepingB.to keep

C.keptD.keeps

【答案】B

【解析】

句意:只保持教室整洁是不够的。

考查非谓语动词。keeping动名词;to keep动词不定式;kept动词过去分词;keeps动词三单。此处是固定句型it’s+adj.+to do sth.,意为“做某事是……的”,其中it为形式主语,其后动词不定式为真正主语,所以此处用动词不定式,故选B

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