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13.If he___ to the teacher attentively,he ___the answer to the problem now.(  )
A.had listened; would have knownB.listened; would know
C.listened; would have knownD.had listened; would know

分析 如果在过去的一年里他认真听老师讲课了,那么他现在就能够知道这个问题的答案了.

解答 从in the past year 判断前面条件状语从句是对过去进行假设,应该用过去完成时;而后面主句中的now则提示应该是对现在的虚拟,应该用would+动词原形,所以整个句子是混合型的虚拟语气,正确答案为D.

点评 考查混合型虚拟语气.

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