She had three sons,all___became doctors.

She had three sons,all___became doctors.
a.of which
b.which
c.of whom
d.who
请问这题是考什么知识点的?要选择哪一项?请说明原因,谢谢!
那主语是she谓语是had宾语是?all___became doctors在句中是充当宾语吗?
英语人气:334 ℃时间:2019-12-13 18:07:44
优质解答
答案:C.考定语从句.先行词“threesons”表人,所以后面宾语选whom,又因为是三者,所以是allofwhom
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