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As it turned out to be a problem of no importance , we     so much time looking into it .
A.needn’t spendB.didn’t have to spend
C.needn’t have spentD.oughtn’t to spend
C

试题分析:句意:因为结果证明这是个不重要的问题,我们本不必花这么多的时间调查它。从这句话的一般过去时态,可以判断AD是错的,B项是过去不必做,是表示事实,而这里表示的是虚拟语气,本不必做而做了,用needn’t have done,选C。
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