She is a teacher ,( )is clear from her manner.A.thatB.whatC.asD.who并说明选择的理由

问题描述:

She is a teacher ,( )is clear from her manner.
A.that
B.what
C.as
D.who
并说明选择的理由

C 这里既要起到连词的作用,还要起到引导词的作用,非as莫属.