Mr. Smith, I should tell you this is the fifth time you ______ me for my twin sister.
A．have mistakenB．a(chǎn)re mistaking
C．mistookD．a(chǎn)re mistaken
A

試題分析：句意：史密斯先生，我應(yīng)該告訴你這是你第五次把我誤認(rèn)為是我的孿生妹妹。根據(jù)前面的this is the fifth time可知，后面用現(xiàn)在完成時(shí)。故選A。
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