【題目】The teacher came into the classroom while the students _________ their homework.

A. are doing B. did C. were doing

【答案】C

【解析】

句意:當(dāng)學(xué)生們正在做作業(yè)的時(shí)候,老師走進(jìn)了教室。are doing正在做,現(xiàn)在進(jìn)行時(shí);did做,是do的過去式;were doing正在做,過去進(jìn)行時(shí)。根據(jù)句中The teacher came into…可知,這句話用的是過去時(shí)態(tài),且從句中表示的是正在進(jìn)行的動(dòng)作,因此應(yīng)用過去進(jìn)行時(shí)態(tài),選C。

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