Judy Black, ____ is in charge of the clerical staff, is the Offi

Judy Black, ____ is in charge of the clerical staff, is the Office manager.
A、that
B、who
C、whom
D、both a and b
【正确答案】：B
【题目解析】：____is in charge of the clerical staff 为定语从句先行词为Judy Black，因此选用who 来引导非限制性定语从句