Mr. Pike _________ English at your school for 20 years before he retired last year. was teaching

Câu hỏi :

Mr. Pike _________ English at your school for 20 years before he retired last year.

A. was teaching

B. has been teaching

C. is teaching 

D. had been teaching

* Đáp án

D

* Hướng dẫn giải

Đáp án D

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