punch and knock

[jiang]

Dear teachers,

I have a question to ask:

The boxer _________ his opponent as hard as he could.

a. punched b. knocked
"a" is of course the key. What about "b". Can I use "knock", too?

Looking forward to hearing from you.

Thank you in advance.

Jiang

[Casiopea]

knock on (a flat surface), knock over (to push over). Boxers usually don't 'knock over" their opponents; they knock 'em out (cold).

[jiang]

Dear Cas,
Thank you very much for your explanation. Now I see.

Jiang

knock on (a flat surface), knock over (to push over). Boxers usually don't 'knock over" their opponents; they knock 'em out (cold).

[Casiopea]

You're welcome, Jiang.