When he came back from abroad, John told his parents about the cities and the people he had visited.
A. who
B. which
C. where
D. that
网友回答
A. who
B. which
C. where
(答案→)D. that
解析：考查定语从句。本定语从句的先行词是the cities and the people先行词既有人又有物，使用that，在句中做visit的宾语；who只能之人； which只能指物。Where在句中做状语。故D正确。