Mary is the only one of the girls who often late for school.
A. is
B. are
C. es
D. get
网友回答
(答案→)A. is
B. are
C. es
D. get
解析： Who作定语从句的主语时，其谓语取决于先行词。但要注意：....one of the ...复数名词 + who / that / which + 复数谓动；....the only one of the .... 复数名词 + who / that / which + 单数谓动。