【題目】When the teacher came into the classroom, most of the students ________ homework.

A. do B. did C. were doing D. are doing

【答案】C

【解析】

當(dāng)老師走進(jìn)教師時(shí)，大多數(shù)學(xué)生正在寫(xiě)作業(yè)�？疾鞎r(shí)態(tài)。根據(jù)前半句when當(dāng)……的時(shí)候，句中動(dòng)詞是came是一般過(guò)去時(shí)，后半句應(yīng)該用過(guò)去進(jìn)行時(shí)，用was/ were+ doing，這里的主語(yǔ)是students，可數(shù)名詞復(fù)數(shù)，故選C

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