问题补充：
If I the answer to the question , I you..
A. know; would tell
B. would know; would tell
C. knew ; would tell
D. know ; tell
答案：
A. know; would tell
B. would know; would tell
(答案→)C. knew ; would tell
D. know ; tell
解析：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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