高二英语—虚拟语气的选择题

问题描述:

高二英语—虚拟语气的选择题
If he ______ it ,he ______ it.
A.had seen ; could have believed
B.saw ; couldn’t believe
C.saw ; couldn’t have believed
D.has seen ; had believed
为什么选B?

因为这是和现在事实相反,所以从句用过去时主句用could、should,might,would,加动词原形