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    【题目】After the experts ________ a whole year on the traffic issue, they finally came to a solution.

    A.had spentB.were spendingC.have spentD.would spend

    【答案】A

    【解析】

    考查时态。句意：专家们在交通问题上花了整整一年的时间，最后终于找到了解决办法。根据they finally came to a solution可知主句是一般过去时，且spend发生在came之前，因此从句的时态是过去完成时。故选A项。

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