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

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(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。