Mr. Smith, I should tell you this is the fifth time you ________ me for my twin sister.A.have mistakenB.are mistakingC.had mistakenD.are mistaken
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A解析句意：史密斯先生，我应该告诉你这是第五次你把我误认为我的孪生妹妹了。“This is the second/third/...time that从句”句式中，that从句的谓语动词要用现在完成时。如：This is the third time that I have been to the Summer Palace up to now.