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 如果在過去的一年里他認真聽老師講課了,那么他現(xiàn)在就能夠知道這個問題的答案了.

解答 從in the past year 判斷前面條件狀語從句是對過去進行假設(shè),應(yīng)該用過去完成時;而后面主句中的now則提示應(yīng)該是對現(xiàn)在的虛擬,應(yīng)該用would+動詞原形,所以整個句子是混合型的虛擬語氣,正確答案為D.

點評 考查混合型虛擬語氣.

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