The book has helped me greatly in my daily communication, especially at work ________ a good impress...
2022-09-15 14:10:20 184次 天津市，宝坻一中，大港一中等）2019届高三上学期期中联考英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
The book has helped me greatly in my daily communication, especially at work ________ a good impression is a must.
A. which B. that
C. where D. when
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