We an old man lying in the road who was badly ill.A. came alongB. came byC. came acrossD.

问题补充：

We an old man lying in the road, who was badly ill.

A. came along

B. came by

C. came across

D. came up

答案：

A. came along

B. came by

(答案→)C. came across

D. came up

解析：A. came along出现 B. came by得到 C. came across偶然遇到 D. came up想出；句意：我们偶然遇到一个病的很严重的老人正躺在马路上。根据句意，故选C