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。 13.一个比例的两个外项积是0.4,一个内项是0.1,写出符合条件的两个比.