题目内容
17．-My little sister a bad cold since last week．-I'm sorry to hear that．（ ）
| A． | has | B． | had | C． | is having | D． | has had |
分析 --我的小妹妹自从上个星期以来就患了重感冒．
--听到你这么说感到很难过．
解答 答案：D．根据since last week，可知这里的意思是自从上个星期以来，since引导的时间状语从句通常和现在完成时连用，而现在完成时的构成形式为：：have/has+动词过去分词形式．My little sister是单数形式，在这里用has+动词过去分词．故选D．
点评 本题考查了现在完成时的有关知识．解答时注意现在完成时的构成形式为：have/has+动词过去分词形式．
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