Sorry to say it will be years _______ we really have classes here with only 25 students.
A．sinceB．that C．whenD．before
D

試題分析：句意：遺憾地說在過幾年之后，我們真地僅僅有25個學生。這里是固定句型it is+時間段+ before過了多長時間就……。故選D。
點評：本題難度適中。判斷從句中用哪個連詞，需用記住連詞的用法，在句中的作用，連詞也是高考的熱點，需要考生平時多練習。需要考生會分析句子成分理解句意。
即學即練：How long is it _______ we visited your mother? 
A. since           B. that             C. when                 D. before
解析:A。句意:自從我們看望你母親以來到現(xiàn)在有多長時間了？
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