问题

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

正确答案是：

同类题型

The ________ girl sings ________ .

I wish you＿＿＿＿＿＿go with me tomorrow.

He _____ go out with his parents, but now he ______ staying at home alone.

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my classmates accidentally ____ he had cheatedin the last examination, or he wouldn’t have got so high a mark.