摘要： If he to the teacher attentively, he the answer to the problem now. A. had listened, would have known B. listened, would know C. listened, would have known D. had listened, would know
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If he ___ to the teacher attentively, he ___ the answer to the problem now.
A. had listened, would have known B. listened, would know
C. listened, would have known D. had listened, would know
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