I my pen when I in the park.A. lost; was walkingB. lost; walkedC. was losting; was walki

问题补充：

I my pen when I in the park.

A. lost; was walking

B. lost; walked

C. was losting; was walking

D. was losting; walked

答案：

(答案→)A. lost; was walking

B. lost; walked

C. was losting; was walking

D. was losting; walked

解析：考查时态。句意“当我正在公园散步时，我的钢笔丢了。”lose是短暂性动词，不能用于进行时，排除C、D；根据句意可知，A项正确。故选A。