．It was the four years from - I spent studying for a master’s degree I will ne

问题补充：

．It was the four years from -, I spent studying for a master’s degree, I will never forget．

A. when; that

B. when; when

C. that; that

D. which ; that

答案：

A. when; that

B. when; when

(答案→)C. that; that

D. which ; that

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