Mr. Wang who is said to have immigrated to the USA at No.2 Middle School in our city fo

问题补充：

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：

A. has been teaching

B. was teaching

(答案→)C. taught

D. has taught

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