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【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】

考查時態(tài)。句意：專家們在交通問題上花了整整一年的時間，最后終于找到了解決辦法。根據they finally came to a solution可知主句是一般過去時，且spend發(fā)生在came之前，因此從句的時態(tài)是過去完成時。故選A項。

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