题目内容

【题目】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】

当老师走进教师时,大多数学生正在写作业。考察时态。根据前半句when……的时候,句中动词是came是一般过去时,后半句应该用过去进行时,用was/ were+ doing,这里的主语是students,可数名词复数,故选C

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