Question

【题目】

If you want to have a good mastery of knowledge，you must_______ what you are being taught in class and make immediate use of it.

A．depend on

B．decide on

C．focus on

D. keep on

Answer 1

【答案】C

【解析】本题的句意要求是：课堂上应该将注意力集中在所教的内容上，所以用focus on把注意力集中在某件事情上。