He thought nobody was around , but he was in fact seen into the office building .
A. to steal
B. steal
C. stole
D. stolen
网友回答
(答案→)A. to steal
B. steal
C. stole
D. stolen
解析：考查非谓语动词。句意：他认为周围没有人，但是实际上有人看到他进入大楼偷东西了。See后面接不带to的不定式，但是当变成被动语态时，后面要加上to，故选A。