题目内容
20．Avatar is an interesting film．I ______ it twice already．（ ）| A． | see | B． | saw | C． | have seen | D． | will see |
分析 阿凡达是一部有趣的电影．我已经看过两次了．
解答 答案：C
根据already，可知应该用现在完成时态．already是现在完成时的标志词．现在完成时态表示过去发生或已经完成的动作对现在造成的影响或结果．现在完成时态的构成：助动词have/has+过去分词，结合句意：阿凡达是一部有趣的电影．我已经看过两次了．故选C．
点评 本题主要考查动词时态，做此类题目要注意时间状语、标志词．根据上下文所表达的含义，做出判断．同时更应记清时态的构成形式．就本题而言，主要考查现在完成时态．
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