Some ______are ______their time to help the old people.
A．volunteer; volunteer B．volunteers; volunteering
C．volunteering; volunteers D．volunteers; volunteers
B

試題分析：句意：一些志愿者在自愿花時(shí)間幫助老人。volunteer志愿者，名詞，volunteer to do sth.自愿去做某事，動(dòng)詞，這是一個(gè)現(xiàn)在進(jìn)行時(shí)的句子，故選B。
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