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【题目】The volunteers ________ up the park when the winds began to blow strongly.

A.were cleaningB.cleansC.cleanedD.are cleaning

【答案】A

【解析】

句意:当风开始刮得厉害时,志愿者们正在打扫公园。

根据句意理解以及句子结构可知,当风刮的厉害的时候,志愿者们正在做某件事情,这种结构在英语中表示当一个动作发生时,另外一个动作正在进行,要用过去进行时,所以选择A答案。

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