We couldnt solve the problem until our teacher arrived.

Câu hỏi :

We couldn't solve the problem until our teacher arrived.

A. When our teacher arrived, we solved the problem.

B. Until our teacher arrived, we were able to solve the problem.

C. Not until we solved the problem could our teacher arrive.

D. Not until our teacher arrive could we solve the problem.

* Đáp án

D

* Hướng dẫn giải

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