【Itwasthirtyyears________hewasinvestedasanoutstandingalumnustocelebratethe128thanniversaryoftheuniversity．A.asB.whileC.beforeD.until】

　　Itwasthirtyyears________hewasinvestedasanoutstandingalumnustocelebratethe128thanniversaryoftheuniversity．

　　A.as

　　B.while

　　C.before

　　D.until