【题目】I _____ along the pavement yesterday when some stranger came up and asked me the way to the nearest hospital.
A. am wandering B. was wandering
C. has wandered D. had wandered
在线课程【答案】B
【解析】
试题分析：根据“when some stranger came up”可知该句要用过去进行时强调当时正在进行的动作，A项是现在进行时，C项是现在完成时，D项是过去完成时，均不符合语境，故选B。