【題目】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】

考查時(shí)態(tài)。句意：專家們?cè)诮煌▎?wèn)題上花了整整一年的時(shí)間，最后終于找到了解決辦法。根據(jù)they finally came to a solution可知主句是一般過(guò)去時(shí)，且spend發(fā)生在came之前，因此從句的時(shí)態(tài)是過(guò)去完成時(shí)。故選A項(xiàng)。

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