The defense works_________long ago to ke

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问题 The defense works_________long ago to keep the enemy away.

选项 A．were builtB．has been builtC．had been builtD．was built

答案D

解析考查动词时态和主谓一致。主语The defense works(防御工程)是集合名词，当成整体考虑，谓语动词要用第三人称单数形式。long ago表示过去的时间，所以用一般过去时态的被动语态。故选D。

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