Câu hỏi :

We won't have a seat unless we book in advance.

A We can't have a seat although we book in advance.

B We won't have a seat if we don't book in advance.

C We will have a seat if we don't book in advance.

D We didn't have a seat because we didn't book in advance.

* Đáp án

B

* Hướng dẫn giải

Phương pháp giải:

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