【题目】—When was Tom bitten by a snake?
—It was on a Sunday _______ he was taking a trip to the mountainous area.
A. that B. when C. which D. where.
在线课程【答案】B
【解析】
试题分析：考查定语从句。句意：汤姆什么时候被蛇咬的，那是他去山区旅行时一个周日。先行词是 Sunday，____ he was taking a trip to the mountainous area.定语从句缺少时间状语，故选B项。