If he _______ to the teacher attentively in the past year, he _______the answer to the question now.
A．had listened; would knowB．listened; knew
C．listens; knewD．has listened ;knows
A

試題分析:考查混合型虛擬語氣。句意：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。從in the past year 判斷前面條件狀語從句是對過去進行假設，應該用過去完成時；而后面主句中的now則提示應該是對現(xiàn)在的虛擬，應該用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A。
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