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

A.keepingB.to keep

C.keptD.keeps

【答案】B

【解析】

句意:只保持教室整潔是不夠的。

考查非謂語動(dòng)詞。keeping動(dòng)名詞;to keep動(dòng)詞不定式;kept動(dòng)詞過去分詞;keeps動(dòng)詞三單。此處是固定句型it’s+adj.+to do sth.,意為“做某事是……的”,其中it為形式主語,其后動(dòng)詞不定式為真正主語,所以此處用動(dòng)詞不定式,故選B。

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