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英语问题(1)I could also see the dilemma because if full credit w

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英语问题
(1)I could also see the dilemma because if full credit were given to him it could mean a good grade for the student in the phisical course.
(2)I suggested that the student have another try at answering the question
(3)He insisted that he deserved a perfect score if the system were not set up against the student.
第一个句子中为什么用were,第二个为什么用have,第三个为什么用were
第一句和第三句:用were 是因为这个是“假设” 而且是虚拟的假设,就是说事实完全不是这样的.
第二句:这里的suggest应该是猜测的意思 相当于guess,也就是说这句也是虚拟.(但为什么不用had,我提供不了解释)
虚拟语气里面没有单数,表示与事实情况相反的“假设”.至于第二句为什么不用had,我手头没有工具书,知识学久了都忘了,抱歉.