问题
选择题
Tom, who _________English for 20 years in English, now has been appointed headmaster of our school．
A．had taught
B．has taught
C．taught
D．had been teaching
答案
答案：C
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Tom, who _________English for 20 years in English, now has been appointed headmaster of our school．
A．had taught
B．has taught
C．taught
D．had been teaching
答案：C