The thief was caught his hand into the pocket of a passenger.A. to be puttingB. to put C.

问题补充：

The thief was caught his hand into the pocket of a passenger.

A. to be putting

B. to put

C. putting

D. put

答案：

A. to be putting

B. to put

(答案→)C. putting

D. put

解析：考查固定搭配。固定搭配catch sb doing sth抓住某人正在做某事；本句是其被动语态sb be caught doing 某人做某事的时候被抓住。句意：当这个小偷把手伸进乘客的口袋的时候，当场被抓住。故C正确。

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