it is true that a student’s most important goal is to do well in his or her studies it d

问题补充：

it is true that a student’s most important goal is to do well in his or her studies, it doesn’t need to be the only goal．

A. When

B. As

C. While

D. Before

答案：

A. When

B. As

(答案→)C. While

D. Before

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