【题目】We ______ on it for many hours, but we have not yet reached any conclusion. ( )
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【答案】C
【解析】
句意：我们已经做了很多小时了，但我们还没有得出任何结论。根据but后时态，可以判断出到现在还没有得出结论，有可能还要继续下去，所以要现在完成进行时。故选C。
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