sat找错 为什么不用虚拟语气?补充图片If not for bees,(which are) responsible (for pollinating) the vast majority of Earth's flowers,many plants (were unable) (to produce) fruits or seeds.(No error)

问题描述:

sat找错 为什么不用虚拟语气?
补充图片
If not for bees,(which are) responsible (for pollinating) the vast majority of Earth's flowers,many plants (were unable) (to produce) fruits or seeds.(No error)

谁说不用啊!
应将 were unable 改为 would be unable.这不就是虚拟语气?