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We _______ on it for several hours but we have not yet reached any conclusion.
A.workB.areworkingC.havebeenworkingD.havebeenworked
C

答考查时态。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。
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