2. 外语
  3. It is the duty of every citizen to defend his country when it (attack) ______ by the enemy.

It is the duty of every citizen to defend his country when it (attack) ______ by the enemy.

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问题 It is the duty of every citizen to defend his country when it (attack) ______ by the enemy.
选项
答案is attacked
解析 本题中attack和one’s country之间是被动关系，应该填入动词的被动语态；因为主句使用了一般现在时，从句应使用同样的时态。故is attacked为正确答案。
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