I had never seen him before , so I did not recognize him.

句型转换成 _____ _____ _____ him before, I did not recognize him.

Without having seen
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第1个回答  2011-02-26
I haven't seen
第2个回答  2011-02-26
because never seen
第3个回答  2011-02-27
i did't know
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