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

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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