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        1. I had been looking for the book for two days _______ I found it at last.
          A. untilB. whenC. whileD.before
          D

          試題分析:考查連詞:A.  until直到,B.   when當(dāng)…時(shí)候,C.    while當(dāng)…時(shí)候,雖然,然而,D. before在…前面,…才…,因?yàn)榍懊媸沁^去完成式,所以是發(fā)生在過去的動(dòng)作前的動(dòng)作,句意:在我最后找到它之前,我已經(jīng)找了這本書兩天了;蚴牵何艺伊诉@本書兩天才找到。選D。
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