The book has helped me greatly in my daily communication, especially at work ________ a good impression is a must.

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1. (2014·江苏) The book has helped me greatly in my daily communication, especially at work ________ a good impression is a must.

A . which B . when C . as D . where

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使用过本题的试卷

2014年高考英语真题试卷（江苏卷）