The blood,the carrier of these substances,is pumped through

lwxy5202022-10-04 11:39:541条回答

The blood,the carrier of these substances,is pumped through a closed system of blood vessels by the heart,which in mammals is really 2 pumps in series with each other

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789789963 共回答了20个问题 | 采纳率95%
这些物质的承载者——血液,被心脏通过封闭的血管系统输送.这在哺乳动物中……
我没看懂你那个“2”,没法翻译.
1年前

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定语从句的时态 had taken 是过去完成时
根据意思 主语的时态应该是过去时
move有复数吗?上次做完型填空,主语是The blood 我选了moves 结果错了.
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