Câu hỏi :

Choose the best answer to complete the following sentences.

A. he had opened

B. did he open

C. had he opened

D. has he opened

* Đáp án

* Hướng dẫn giải

Đáp án: C

Đảo ngữ: Hardly+ had +Ved/P2 when S+ Ved/P1

Dịch: Anh ta vừa mở cửa thì chuông điện thoại reo.

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