The old man has two sons, ____________ are working in th Wap版

试题详情及答案解析

The old man has two sons, ____________ are working in the supermarket.

A．both of whom	B．each of them
C．both of them	D．all of whom

答案：A

试题分析：考查定语从句。本题定语从句的先行词是two sons，定语从句中关系代词whom指代先行词作为介词of的宾语，因为先行词是two sons, 所以使用both。故A正确。
考点：考查定语从句