The heart is believed to _____blood into veins(血管) which are netted all over the body, thus keeping a person alive.
| A．give | B．donate | C．circulate | D．pump |
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The heart is believed to _____blood into veins(血管) which are netted all over the body, thus keeping a person alive.
| A．give | B．donate | C．circulate | D．pump |
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