◎ 题干
Mr. Irving, who ____ in a high school for forty years, is now living in retirement.
[     ]
A. has taught
B. taught
C. had taught
D. has been teaching
◎ 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“Mr. Irving, who ____ in a high school for forty years, is now living in retirement. [ ]A. has taught B. taught C. had taughtD. has been teaching …”主要考查了你对  【一般过去时】  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。