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if he ______ me tomorrow,I would let him know

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if he ______ me tomorrow,I would let him know
A should call B should have been able C were to call D are able to call
我选的是A 但是答案是C 在对将来的虚拟语气中A 和C 不是都能用吗?
答案错了,就应该选A,在与将来事实相反的条件句中,三种结构所表示的可能实现的程度是有区别的:were to 的可能性最小,should do的可能性稍大一些,did 处在中间程度.