My youngest sister, ____ is forty years old, has got a life professorship in this university.

A、which

B、whom

C、who

D、that

请帮忙给出正确答案和分析，谢谢！

A、is

B、m

C、re

A、He's

B、She's

C、This

A、 my sister’s

B、I sister

C、 me sister

D、 me sisters’

A、My sister is more outgoinger than me

B、My sister is outgoinger than me

C、My sister is more outgoing than me

A、This is my brother

B、That is my sister

C、This is my teacher

A、She’s my mother

B、He’s my brother

C、She’s my sister

A、give

B、have

C、let

D、ask

A、My brother and sister are in Class Six

B、My brother and sister are in Grade six

C、My brother and sister are in Grade Six

A、She is my sister

B、Is she your sister

C、Is he your sister

A、He’s my dad

B、He’s my sister

C、He’s my brother