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  3. ______the thing, John would have told you about it.

______the thing, John would have told you about it.

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问题 ______the thing, John would have told you about it.
选项 A、If he has known
B、Had he known
C、If he knew
D、Should he know
答案B
解析 根据句意和主句中的would have told可知，本句是对过去情况的虚拟，所以if从句应用过去完成时，即从句谓语动词应用“had+过去分词”的形式。当条件句中含有were，had或should时，可以省略if，并把这些词提至句首，以强调假设条件的虚拟性或突出说话人的主观愿望。故选B。
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