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当……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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