20．---Why didn't you try your best to get on the train？
---I tried，but ______ I could，it started to move．（　�。�
A．whenB．afterC．untilD．before

分析 ---你為什么沒盡量上火車呢？
---我試過了，但是我還沒來得及上車，它就開動了．

解答 答案：D
 根據(jù)答語可知，此處表達的意思是：我還沒來得及上車（在我試著上車之前），火車就開動了；A when 在…時候； B  after在…以后；  C  until到…為止，或在…以前，在這種用法中，句子的謂語動詞必須是持續(xù)動詞，如live，wait，last，stay，work，continue 等，而此處省略的謂語 get on （上車）是非延續(xù)性動詞；故排除C；  D  before在…之前，還沒來得及…就；由于A．B用在此處不合句意；故選D

點評 本題考查了連詞before的用法．做本題時，首先應(yīng)根據(jù)句意，判斷出空缺處所表達的意思；其次應(yīng)熟練掌握選項中各連詞的意義及用法區(qū)別，尤其是 until當"在…以前"講時，與before的區(qū)別．

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