题目内容

It’s their duty for the soldiers          our country          our enemies.
A．to prevent; fromB．to keep; from
C．to protect; fromD．to defend; with
C

试题分析：不定式做主语和固定词组。在本句中it是形式主语，真正的主语是后面的不定式短语。固定词组protect sb from sth保护某人不受…的伤害；prevent sb from doing sth阻止某人做某事；句意：对于士兵们来说，保护我们的国家不受敌人的伤害是他们的责任。根据句意说明C项正确。
点评：在英语中只有it可以做形式主语或者形式宾语，固定词组protect sb from sth保护某人不受…的伤害；prevent sb from doing sth阻止某人做某事；
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