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Mr. Smith ________ his pupils how to prepare for the test since 8 am, but no one listens to him.
A.has told B.is telling
C.has been telling D.will have told
C
句意:Mr.Smith从早上8点开始就一直在不停地告诉学生们如何准备考试,但没有一个学生听他讲。空处的动作从过去某一时间开始一直延续到现在,可能还要继续下去,因此应用现在完成进行时。故答案选C。
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