This robot is supposed to save a lot of labor, but it remains a problem if it ( ). ( 章节：8 难度：2)
- A、is
- B、saves
- C、does
- D、has
正确答案:C
答案解析:有
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This robot is supposed to save a lot of labor, but it remains a problem if it ( ). ( 章节：8 难度：2)
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