I’m sure it is( )usually answers the telephone.

I’m sure it is( )usually answers the telephone.
A、her whom
B、her who
C、she whom
D、she who
【正确答案】:D
【题目解析】:句意:我确信经常接电话的人是她。is后面要用宾格,故只能用her;从句中缺少主语,因此引导词只能用who。