Choose the best one: Scientists have found a way by which they can convert all blood types into O-type blood, .........?

Câu hỏi :

Scientists have found a way by which they can convert all blood types into O- type blood, .........?

A. can they

B. has it

C. haven’t they

D. have they

* Đáp án

C

* Hướng dẫn giải

Kiến thức: Câu hỏi đuôi

Chủ ngữ “scientists” chuyển thành “they”, “have” chuyển thành “haven’t”.

Chọn đáp án C

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