问题
选择题
Mr. Wang, who is said to have immigrated to the USA, __ at No.2 Middle School in our city for twenty years.
A．has been teaching
B．was teaching
C．taught
D．has taught
答案
答案：C
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Mr. Wang, who is said to have immigrated to the USA, __ at No.2 Middle School in our city for twenty years.
A．has been teaching
B．was teaching
C．taught
D．has taught
答案：C