The boy was often seen___the road.A.not go across B.not to cross C.not cross D.not go across
问题描述：
The boy was often seen___the road.A.not go across B.not to cross C.not cross D.not go across
答
B.not to cross
原因：是句型see sb do sth,但在英语中,当see用于被动语态时,动词前面必须恢复不定式符号to