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

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

【答案】A

【解析】

句意：當(dāng)事故發(fā)生時(shí)，你在做什么？考查時(shí)態(tài)。固定句型was/were doing sth. when sth./sb. did正在做某事這時(shí)……。happened一般過(guò)去時(shí)符合結(jié)構(gòu)。故選A。

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