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The defense works_________long ago to keep the enemy away.
A．were built
B．has been built
C．had been built
D．was built
B．has been built
C．had been built
D．was built
参考答案
参考解析
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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