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

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

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

He wants to know how ____ popcornA.to make B.makes C.making D.make请说明原因~
A
how to do sth,.
怎样做某事、

A.to make
动词不定式短语做know的宾语