She had two sons,__________became doctorsA.all of themB.all of whomC.both of themD.both of whom说明理由,
问题描述:
She had two sons,__________became doctors
A.all of them
B.all of whom
C.both of them
D.both of whom
说明理由,
答
D.both of whom
2个儿子,所以用both
后面的是宾语从句,所以用whom.