The old man has four sons, and two turned doctors．A.of whichB.of whomC.of themD.
来源：网络
时间：
推荐文章
The old man has four sons, and two _____ turned doctors．
A.of which
B.of whom
C.of them
D.of that
试题答案
C
The old man has four sons, and two _____ turned doctors．
A.of which
B.of whom
C.of them
D.of that
C