He looked around and caught a man ________ his hand into the pocket of a passenger．
A.putB.to be puttingC.to putD.putting在线课程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.