Question

【题目】The boys volunteer three hours ________ up the park near their school.

A.cleaningB.to cleanC.cleaned

Answer 1

【答案】B

【解析】

句意：男孩们自愿打扫他们学校附近的公园三个小时。

考查非谓语动词辨析。cleaning动名词/现在分词；to clean动词不定式；cleaned一般过去时。固定搭配volunteer to do sth“自愿做某事”，动词不定式作宾语，所以空格处填动词不定式to clean。故选B。