I often go to the English corner to have a free talk with my classmates I am busy. A. ex

问题补充：

I often go to the English corner to have a free talk with my classmates I am busy.

A. except that

B. except for

C. except when

D. except

答案：

A. except that

B. except for

(答案→)C. except when

D. except

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