Twelvepotential vaccines are currently being tested on human ________（志愿者）（根据汉语提-组卷网

单词拼写-根据汉语意思填空适中0.65 引用1 组卷90

Twelve potential vaccines are currently being tested on human ________（志愿者）（根据汉语提示单词拼写）

21-22高一上·重庆石柱·阶段练习

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She has been v ______ (自愿) her time and talents to the work for more than 40 years. (根据中英文提示单词拼写)

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