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【題目】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：當(dāng)風(fēng)開(kāi)始刮得厲害時(shí)，志愿者們正在打掃公園。

根據(jù)句意理解以及句子結(jié)構(gòu)可知，當(dāng)風(fēng)刮的厲害的時(shí)候，志愿者們正在做某件事情，這種結(jié)構(gòu)在英語(yǔ)中表示當(dāng)一個(gè)動(dòng)作發(fā)生時(shí)，另外一個(gè)動(dòng)作正在進(jìn)行，要用過(guò)去進(jìn)行時(shí)，所以選擇A答案。

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