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题目内容双击单词支持查询和收藏哦～
With the introduction of gunpowder and the use of cannons in siege warfare, castles that in earlier years had seemed _____ were easily breached by the new weapons.
- A.invincible
- B.venerable
- C.remote
- D.unique
- E.impregnable
- F.inconsequential
A,E显示答案
以上解析由 考满分老师提供。
