Question

【题目】Jack ________ in the lab when the power cut occurred.

A. works

B. has worked

C. was working

D. would work

Answer 1

【答案】C

【解析】考查时态。句意：突然断电时，杰克正在实验室里工作。根据occurred可知，这里指过去某时刻正在发生的事情，断电时，杰克正在工作，因此要用过去进行时，故选C。