问题
选择题
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
答案：B
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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：B