Hehastwosonsworkaschemists.A.twoofwhomB.bothofwhomC.bothofwhichD.allofwhom请问为什么?D为什么错?有什么固定搭配吗?红P135／123

Question

He has two sons ___work as chemists.
A.two of whom
B.both of whom
C.both of which
D.all of whom
请问为什么?D为什么错?有什么固定搭配吗?
红P135／123

Answer 1

两者都用both,三者或三者以上用all.定语从句里先行词如果是人,则关系代词用who,如果是物则关系代词用which,不管是人也好,物也好都可以用that.如果关系代词在定语从句中充当宾语,则指人的用whom,指物的用which.
eg.There are 50 desks in the classroom,30 of which are new.
She has two sons,one of whom is a doctor.
要注意的事of是介词,后面的代词要用宾格,所以后面的关系代词只能使whom或者which