They are good friends. They _______________ each other for the long time

Câu hỏi :

They are good friends. They _______________ each other for the long time

A. know

B. have known

C. knew

D. were knowing

* Đáp án

B

* Hướng dẫn giải

for the long time: dấu hiệu của thì HTHT

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