The thief was noticed the office building by the back door on the screen.A. enter B. enter

问题补充：

The thief was noticed the office building by the back door on the screen.

A. enter

B. enter into

C. to enter

D. to enter into

答案：

A. enter

B. enter into

(答案→)C. to enter

D. to enter into

解析：考查感官动词。See/notice/watch/hear/make等词，后跟不带to的不定式作宾补，但在被动语态中，要还原to。即，sb. be seen/noticed/watched/heard/made to do sth.。故选C。