This is the office my parents are visiting now.A. whichB. whatC. whoD. where

问题补充：

This is the office my parents are visiting now.

A. which

B. what

C. who

D. where

答案：

(答案→)A. which

B. what

C. who

D. where

解析：考查定语从句。本题定语从句的先行词是the office，which知道先行词在句中做visit的宾语。What不是定语从句的关系词，who所指代的先行词是人；where在定语从句中做状语。句意：这就是我的父母正在参观的办公室。故A正确。