2. 公务员
  3. The defense works___________long ago to keep the enemy away.

The defense works___________long ago to keep the enemy away.

admin2016-06-09  3
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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