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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
【正确答案】：D
【题目解析】：此题考查非谓语动词的用法。catch sb doing sth表示”碰巧撞见某人正在做某事”，符合此句的语境。