Question

【题目】What ____________ at nine o’clock last Sunday morning?

A. was you doing B. were you doing C. are they doing D. does we do

Answer 1

【答案】B

【解析】句意：上星期日早上九点你在干什么？at nine o’clock last Sunday morning是表示过去的时间点，表示在过去的某一时刻的动作要用过去进行时态来表达，其构成为was/were+ doing，主语为you，故答案选B。