He looked around and caught a man ________ his hand into the pocket of a passenger．

A.put

B.to be putting

C.to put

D.putting

答案及解析： D

catch表示“撞见，碰上”，用于碰到某人做某事，多为不好的事.其后常接现在分词的复合结构或介词短语的复合结构，答案为D.例如：He was caught stealing from the shop．

他在这家商店偷东西时，被当场抓获.

We caught them in the middle of their supper．

我们去时正碰上他们在吃晚饭.

He was caught cheating in the exam．

他在考试中舞弊被撞见了.

I caught the boys stealing apples from my garden．

我撞见那些孩子偷我园中的苹果.