◎ 题干
I ____ him ____ he left school.

A. have recognized; since
B. have known; since
C. had recognized; before
D. had known; after
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“I ____ him ____ he left school. [ ]A. have recognized; since B. have known; sinceC. had recognized; before D. had known; after …”主要考查了你对  【从属连词】【动词】【现在完成时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。