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If I ___ the answer to the question , I ____  you..
A.know; would tellB.would know; would tell
C.knew ; would tellD.know ; tell
C
此题考查虚拟语气的用法。题意为:如果我知道这个问题的答案,我就会告诉你。真正的事实是:我不知道答案,我也没法去告诉你。与现在事实相反,从句用动词的过去式,主句用四个情态动词would , could ,should  ,might 加动词原形。故选D。
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