Question

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

Answer 1

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。