---I am sorry to keep you waiting.---Not at all. I ______here a few minutes ago.A have been B had been C was
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a few minutes ago提示只能用一般过去时，选c， 我也是几分钟前才到。
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choose C .according to ...ago.
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选C,这道题好象是用现在完成时A,说的是他一直在这等着,可是语意上说他几分钟前刚到这,是个时间点所以用过去时.
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选have been ，b肯定不对，过去完成式，c was是过去式，说明他三分钟前在这儿，显然不对。
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the answer is C. "was"I __was__here a few minutes ago.a few minutes ago 表示几分钟前。动词必须用过去式。
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b
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A