This robot is supposed to save a lot of labor, but it remains a problem if it ______.

   A. is B. saves C. does D. has

C


解析:

do(es) 是代動(dòng)詞，用來(lái)代替上文save a lot of labor。

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This robot is supposed to save a lot of labor, but it remains a problem if it ______.

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