问题补充：
The policeman looked around and caught a manhis hand into the pocket of a passenger.
A. put
B. to be putting
C. to put
D. putting
答案：
A. put
B. to be putting
C. to put
(答案→)D. putting
解析：考察固定搭配。固定搭配catch sb doing sth抓住某人正在做某事；句中的动词putting和catch是同时发生的事情，故使用现在分词的形式来表示。句意：那个警察环顾四周，当场抓住一个把手伸进乘客口袋的人。故D正确。
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