He taught his father how to get to know is going on in his university life on the Interne

问题补充：

He taught his father how to get to know is going on in his university life on the Internet.

A. how

B. that

C. what

D. which

答案：

A. how

B. that

(答案→)C. what

D. which

解析：宾语从句中缺少主语，用what代替。