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15.-How clean the classroom is!
--Yes,I am sure that Amy ______ it.(  )
A.is cleaningB.was cleaningC.has cleanedD.had cleaned

分析 -这个房间多干净啊!
-是啊,我确定艾米已经打扫过它.

解答 答案:C
根据How clean the classroom is!可知,"教室很干净,说明已经打扫了",强调对于现在造成的影响,应该用现在完成时态;现在完成时态的结构为have/has+动词的过去分词;又因为主语是Amy,所以助动词应该用has,故选C.

点评 本题主要考查现在完成时,用法:表示过去发生或完成的动作对现在造成的影响或结果,还表示过去发生动作一直持续到现在.其结构是have/has+及物动词的过去分词.

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