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

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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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