Anyone ordering a new MP3 player _________ the end of the month will receive a free extra set of headphones.

Câu hỏi :

Anyone ordering a new MP3 player _________ the end of the month will receive a free extra set of headphones.

A at

B in

C upon

D before

* Đáp án

A

* Hướng dẫn giải

Phương pháp giải:

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