Question

 Yesterday evening, I _____ along the street when I suddenly met my maths teacher.

A. walk          B. walked         C. was walking        D. am walking

Answer 1

C

解析: 考查时态。根据句意：我在街上散步时，遇到了我的数学老师。当一个动作（met my maths teacher）发生时，另外一个动作（散步）正在进行。故“散步”这一动作用过去进行时，故选C。