问题
选择题
He _______ in a university for five years, but now he runs a company of his own.
A．has taught
B．had taught
C．taught
D．has been teaching
答案
答案：C
略
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He _______ in a university for five years, but now he runs a company of his own.
A．has taught
B．had taught
C．taught
D．has been teaching
答案：C
略