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一道SAT语法题14.If not for bees,which are responsible for pollina

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一道SAT语法题
14.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.
were unable哪里不对了?
一道SAT语法题14.If not for bees,which are responsible for pollina
楼主!这是我前几天的作业啊?你在哪学的SAT?if 后面引导的虚拟语气,所以were able to do 应该改成would be able to do,顺便问下,楼主在纽约?
再问: 在新东方学的,我还在中国的说
再答: ....不好意思,太巧了...