We an old man lying in the road, who was badly ill.
A. came along
B. came by
C. came across
D. came up
网友回答
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