Tom studies harder this term. he has made great progress in his lessons.A. As a resultB.

问题补充：

Tom studies harder this term. , he has made great progress in his lessons.

A. As a result

B. After all

C. By the way

D. Instead

答案：

(答案→)A. As a result

B. After all

C. By the way

D. Instead

解析：as a result结果，因此；after all毕竟；by the way顺便说一下；instead代替。