178. There are four basic _____ of blood in the human body. What do you belong to, A, B, AB or O?
| A．kinds | B．sorts | C．types | D．Classes |
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178. There are four basic _____ of blood in the human body. What do you belong to, A, B, AB or O?
| A．kinds | B．sorts | C．types | D．Classes |
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