题目

He looked around and caught a man __________ his hand into the pocket of a passenger.A.put B.to be putting C.putting D.to put 答案：【答案】C【解析】考查现在分词。句意：他环顾四周，偶然撞见一个男人把手放进了一位顾客的口袋里！catch sb doing sth 偶然撞见某人在干某事，这里的现在分词是做宾语补足语，强调动作的主动和进行，故选C。已知二次根式2x-5，则x的取值范围是 ．