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【题目】Look! They are ______ their homework. (  )

A.doB.didC.doing

【答案】C

【解析】

句意:看!他们正在做他们的家庭作业。由look可知该句是现在进行时态,其构成是:主语+be动词+现在分词。空格前有be动词,其后出现的动词应为动词的现在分词形式。A动词原形,B动词的过去式,C动词的现在分词,故选C

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