He wants to know how ____ popcornA.to make B.makes C.making D.make请说明原因~

问题描述:

He wants to know how ____ popcorn
A.to make B.makes C.making D.make
请说明原因~

A.to make
动词不定式短语做know的宾语

A
how to do sth,.
怎样做某事、