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

試題分析：不定式做主語和固定詞組。在本句中it是形式主語，真正的主語是后面的不定式短語。固定詞組protect sb from sth保護某人不受…的傷害；prevent sb from doing sth阻止某人做某事；句意：對于士兵們來說，保護我們的國家不受敵人的傷害是他們的責任。根據(jù)句意說明C項正確。
點評：在英語中只有it可以做形式主語或者形式賓語，固定詞組protect sb from sth保護某人不受…的傷害；prevent sb from doing sth阻止某人做某事；
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