Jack ___________ in the lab when the power cut occurred.A．worksB．has workedC．was_刷题宝

题干

Jack ___________ in the lab when the power cut occurred.

A．works	B．has worked
C．was working	D．would work

上一题下一题 0.65难度单项选择更新时间:2018-06-08 07:08:22

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