He is is known as a hacker ---- he likes to show off on the Internet and attack websites.

问题补充：

He is is known as a hacker ---- he likes to show off on the Internet and attack websites.

A. who

B. what

C. that

D. which

答案：

A. who

(答案→)B. what

C. that

D. which

解析：可联系答.案.网客服索取。