(·皖南八校联考) a lady of her necklace the young man was arrested on the spot by a policem

问题补充：

(·皖南八校联考) a lady of her necklace, the young man was arrested on the spot by a policeman.

A. Having caught robbing

B. Caught robbing

C. Being caught robbing

D. Catch robbing

答案：

A. Having caught robbing

(答案→)B. Caught robbing

C. Being caught robbing

D. Catch robbing

解析：选B考查非谓语动词作状语。句意：那个年轻人在抢一位女士的项链时被发现了，警察当场逮捕了他。catch sb doing sth.表示“发现某人正在做某事”，catch与the young man为动宾关系且表示完成，故用过去分词。