PS这是虚拟语态,用C有它的理由（事实上她不能是任何时候都不能事实型,而且也不需要后退时态等）这里是语法问题,不是一般的can和could区别.
I hope this may help you,but I am not sure.
can 和 could 的区别If it were not for the fact that she_____sing
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