The defense works______long ago to keep the enemy away.

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问题 The defense works______long ago to keep the enemy away.

选项 A、were built
B、has been built
C、had been built
D、was built

答案D

解析本题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，故排除A；long ago表示过去的时间，所以用一般过去时态的被动语态。故本题选D。

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