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If he _____to the teacher carefully,he______ the answer to t

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If he _____to the teacher carefully,he______ the answer to the question now.
A.had listened,would have known
B.listened,would know
C.listened,would have known
D.had listened,would know
D.had listened,would know
如果他认真的听老师讲了,他现在就应该知道答案了.
前半句,与过去相反,用过完; 后面与现在相反,用过去式 或过去将来.
再问: 是和虚拟语气有关吗? 谢谢
再答: 嗯,看我的翻译,就知道,是虚拟语气了.