【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】

當老師走進教師時，大多數(shù)學生正在寫作業(yè)�？疾鞎r態(tài)。根據(jù)前半句when當……的時候，句中動詞是came是一般過去時，后半句應該用過去進行時，用was/ were+ doing，這里的主語是students，可數(shù)名詞復數(shù)，故選C

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