题目内容
20.Mike used to be a top student,but he______ behind since he lost himself in computer games.( )A. | fell | B. | has fallen | C. | was | D. | has been |
分析 迈克过去是一个优等生,但是自从他在电脑游戏中迷失自己,他就落后了.
解答 答案:D
首先此句是含时间状语从句的主从复合句.根据时间状语从句since he lost himself in computer games可知,此句表达"过去的动作对现在造成的影响",所以主句要用现在完成时态;现在完成时态的结构为have/has+动词的过去分词.此处还要要把瞬间动作改为持续动作,所以应该用be behind,故选D.
点评 判断动词的时态,要结合句子的语境及其引导词去判断动词存在的状态.
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