As we know, blood types A and B cannot receive AB, but AB may receive A or B. Type O can give to any other group; hence it is often called the _____ donor. ( 章节：5 难度：3)
- A、general
- B、popular
- C、universal
- D、common
正确答案:C
答案解析:有
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As we know, blood types A and B cannot receive AB, but AB may receive A or B. Type O can give to any other group; hence it is often called the _____ donor. ( 章节：5 难度：3)
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