－Have you seen Mr. Black these days, Jack?
－Yes, I met him when I in the street yesterday.
A. walked
B. was walking
C. have walked
D. is walking
网友回答
A. walked
(答案→)B. was walking
C. have walked
D. is walking
解析：句意：这些天你有看见布莱克先生吗，杰克？是的，当我昨天正在街道上走着时，遇到他了。用过去进行时表示动作正在进行，故选B