The thief was caught by the police and put him into prison soon.A. aB. anC. theD. /

问题补充：

The thief was caught by the police and put him into prison soon.

A. a

B. an

C. the

D. /

答案：

A. a

B. an

C. the

(答案→)D. /

解析：put sb. into prison 是一个固定短语, prison 前面不用冠词.