Question

【题目】—Can you tell me _____when the teacher came into the classroom?

—Sorry,I don’t know．

A. what were the students doing

B. what are the students doing

C. what the students were doing

D. what the students are doing

Answer 1

【答案】C

【解析】试题分析：考查带有宾语从句的复合句。句子描述的是老师进来时，学生们正在做的事，用过去进行时态；宾语从句要用陈述句语序。故选C。