Iron has an important role to play in the____working

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Iron has an important role to play in the____working
of the human body and is vital to health living
A efficient B favorite C primary D current
选哪个?

Iron has an important role to play in the primary working of the human body and is vital to health living.
铁在人体基本的生理工作中发挥重要作用,对健康生活至关重要.

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