【題目】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

【答案】C

【解析】

試題分析：根據(jù)上文是一般現(xiàn)在時，do(es) 是代動詞，用來代替上文save a lot of labor。故選C。

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