--What were you doing 8 last night? --While I was wandering in the street I notic

问题补充：

----What were you doing 8 last night?

----- While I was wandering in the street, I noticed a wallet on the ground.

A. at; laying

B. on; lie

C. on; laid

D. at; lying

答案：

A. at; laying

B. on; lie

C. on; laid

(答案→)D. at; lying

解析：句意：昨晚8点钟你在干什么？我在街道上闲逛时，我发现地上有一个钱包。在某个时刻用at，on 表示在某一天或某一天的某个时段。lying作宾语补足语。