20．The thieves ran away as soon as the alarm _____．（　�。�
A．gave offB．put offC．showed offD．went off

分析 警鈴一響，小偷們就跑走了．

解答 答案D．
give off 發(fā)出（光，煙，氣味等）；put off延期；脫去（衣、帽等）；show off 炫耀；go off（警報）響；離開．根據(jù)時間狀語從句的主語"the alarm"可知句子表達的意思是"警鈴一響，小偷們就跑走了"；故答案選D．

點評 本題考查動詞短語的辨析．英語中有的詞組沒有捷徑，只有平時加強記憶，要注意區(qū)別，記憶的時候不能忽視，這是常見的命題方式．平時要加強記憶，做題時，別忘了要結(jié)合上下文句意判斷．

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