This work costs us nothing; it’s all done by ______.

admin2011-05-29  30

问题 This work costs us nothing; it’s all done by ______.

选项 A、profiteers
B、mountaineers
C、engineers
D、volunteers

答案D

解析 volunteer志愿者;profiteer获暴利的人,投机商人;mountaineer登山运动员;engineer工程师。
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