The book has helped me greatly in my daily communication, especially at work ________ a good impress...
2022-10-11 19:51:21 110次 2017届江苏省高三暑期考试英语试卷（解析版） 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. where C. as when
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