Jack was working in the lab __________ the power cut occurred. A.suddenly B.which C.while D.when
2022-07-06 09:16:21 166次 2020届黑龙江省高三下学期开学考试英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Jack was working in the lab __________ the power cut occurred.
A.suddenly B.which C.while D.when
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