【題目】Look！The students __________ clean up the city park.

A.helpB.is helping

C.were helpingD.are helping

【答案】D

【解析】

句意：看！學(xué)生們正在幫助打掃城市公園。

考查時(shí)態(tài)。根據(jù)“Look！”可知是現(xiàn)在進(jìn)行時(shí)，排除A、C；根據(jù)主語(yǔ)是“The students”可知此處是復(fù)數(shù)，所以謂語(yǔ)動(dòng)詞用“are helping”，故選D。

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