Scientists have found a way by which they can convert all blood types into

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* Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

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

can they

has it

haven’t they

have they

Giải thích

Chọn A A. respectful (a): kính cẩn, tỏ vẻ tôn trọng

B. respective (a): riêng, tương ứng

C. respectable (a): đáng kính

D. respected (a): được tôn trọng