Moviegoers know that many special effects are created by computers. （ ）they often don't know is that these scenes still require a lot of work.
A.正确答案CThat
B.Whom
C.What
D.How
Moviegoers know that many special effects are created by computers. （ ）they often don't know is that these scenes still require a lot of work.
Moviegoers know that many special effects are created by computers. （ ）they often don't know is that these scenes still require a lot of work.
A.正确答案CThat
B.Whom
C.What
D.How
