题目

It is the most instructive lecture that I ________ since I came to this school. A. attended           B. had attended       C. am attending   D. have attended   答案: D   考查动词的时态。句意为“自从我到这个学校以来,这是我所听到的最有教育意义的演讲。”since自从…以来,引导过去时的从句时,主句用现在完成时。选D。  
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