问题
选择题
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
答案：C
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。