When he came back from abroad Joan told us about the cities and the people he had visite

问题补充：

When he came back from abroad, Joan told us about the cities and the people he had visited.

A. that

B. who

C. where

D. which

答案：

(答案→)A. that

B. who

C. where

D. which

解析：考查定语从句。本定语从句的先行词是the cities and the people,既有人又有物，所以使用that指代先行词在定语从句中做visit的宾语。B只能指人，D只能指物。C在句子中做状语。