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 句意:这个防御工程建于很久之前,是为了防止敌人侵略而建造的。“works”并不是“work”的复数形式,而是工程、工厂的意思,故A项错误。“long ago”意为“很久之前”,与一般过去时连用,故本题选D。
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