题目内容
20．He _____ in this factory for 20years already．（ ）| A． | will work | B． | works | C． | has worked | D． | is working |
分析 他已经在这家工厂工作了20年了．．
解答 答案：C．根据"He _____ in this factory for 20years already"中的"for 20years"可知work这个动作从20年前一直延续到现在，要用现在完成时，现在完成时的构成：主语+have/has+动词的过去分词．故选C．
点评 本题考查现在完成时，掌握现在完成时的意义及构成．
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