问题
选择题
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
答案：D
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。
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