Was it through Mary,_____was working at a high shool ,____you got to know Tom?A.who who B.that which C.who that D.who which翻译和原因

Was it through Mary,_____was working at a high shool ,____you got to know Tom?A.who who B.that which C.who that D.who which翻译和原因
Was it through Mary,_____was working at a high shool ,____you got to know Tom?
A.who who B.that which
C.who that D.who which
翻译和原因

Was it through Mary,_____was working at a high shool ,____you got to know Tom?A.who who B.that which C.who that D.who which翻译和原因
D
有逗号就不用that了,排除BC
第一空指代mary 是人,用who,
第二空指代a high school,用which

你是通过那个在高中工作的Mary认识Tom的吗？
选C，who was working at ahigh school是定语从句，由who引导，was it through是强调句型，所以后面用that引导的从句做逻辑主语