Question

【题目】What were you doing when the traffic accident _____________.

A. happenedB. is happeningC. has happenedD. was happened

Answer 1

【答案】A

【解析】

句意：当事故发生时，你在做什么？考查时态。固定句型was/were doing sth. when sth./sb. did正在做某事这时……。happened一般过去时符合结构。故选A。