7、 I had been looking for the book for two days _____ I found it at last
A. until B. when C. before D. while
科目：高中英語 來源：江蘇省2010-2011學(xué)年高三英語一輪過關(guān)測(cè)試（2） 題型：單項(xiàng)填空
I had been looking for the book for two days _____ I found it at last
A. until B. when C. before D. while
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