An average student should know that he needs to spend more time______ so that ______ a top student.

An average student should know that he needs to spend more time______ so that ______ a top student.

A.studying ... he is

B.to study ... he is

C.studying ... he will be

D.to study ... he will be

请帮忙给出正确答案和分析，谢谢！