It is generally believed that study we can gain both knowledge and skills.A. withB. thro

问题补充：

It is generally believed that study, we can gain both knowledge and skills.

A. with

B. through

C. by

D. at

答案：

A. with

(答案→)B. through

C. by

D. at

解析：考查介词搭配。Through study通过学习。by是指使用某种工具；