Little ____ about him when I first met him in that company
A)haveIknownB)hadIknownC)doIknowD)didIknow答案是D为什么不选B？请多多指教！谢谢！...
A) have I known B) had I known C) do I know D) did I know 答案是D 为什么不选B？ 请多多指教！谢谢！
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