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【题目】The boys volunteer three hours________up the park near their school.

A.to cleanB.cleaningC.cleanedD.clean

【答案】A

【解析】

句意:男孩们自愿打扫他们学校附近的公园三个小时。

考查动词不定式作目的状语。to clean动词不定式;cleaning动词的现在分词形式或动名词形式;动名词形式。cleaned动词过去分词;clean动词原形。volunteer three hours后接to do不定式作目的状语,表示自愿花三个小时,目的是为了打扫公园。故选A

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