The engineers in this lab spent several weeks _______ their plans for the new bicycle. ( 章节：3 难度：2)
- A、counting
- B、stripping
- C、elaborating
- D、casting
正确答案:C
答案解析:有
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The engineers in this lab spent several weeks _______ their plans for the new bicycle. ( 章节：3 难度：2)
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