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【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:當學生們正在做作業(yè)的時候,老師走進了教室。are doing正在做,現(xiàn)在進行時;did做,是do的過去式;were doing正在做,過去進行時。根據(jù)句中The teacher came into…可知,這句話用的是過去時態(tài),且從句中表示的是正在進行的動作,因此應用過去進行時態(tài),選C。

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