12.The monkey was seen _____ off the tree.

问题描述:

12.The monkey was seen _____ off the tree.
A.jump B.jumps C.jumped D.to jump
请问这道题是选A吗...但是答案是D.
晕了...
PS :请问大家有被动语态的专项练习吗...最好有答案有讲解...
有答案没讲解错了都不知怎么回事...晕死了

see sb do sth 后面接的是省掉to的不定式感官动词都这样 但一旦用于被动的话要还原to be seen to do