Question

【题目】Do you know _____this time yesterday?

A. what they are doing B. what are they doing

C. what they were doing D. what were they doing

Answer 1

【答案】C

【解析】

句意“你知道昨天这个时候他们在做什么吗？”。空前有know，考察宾语从句，宾语从句用陈述句语序，排除B和D，且根据this time yesterday可知，用过去进行时，故选C。