He has two sons,__________ work as chemists.A.two of whom B.both of whom C.both of whoD.all of whomC为什么不可以选择
问题描述：
He has two sons,__________ work as chemists.
A.two of whom
B.both of whom
C.both of who
D.all of whom
C为什么不可以选择
答
work as以。。。为职业 只不过是个介词，不单独做句子成分。 as本身有 作为 的意思例 As a teacher,he teaches every students well. 另外
答
B
答
额,语法上c可以选,但前面是数词two,all只能用于三者及三者以上,所以用both