A country must always be ________ guard against spies and invaders.A、inB、toC、w

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问题 A country must always be ________ guard against spies and invaders.

选项 A、in
B、to
C、with
D、on

答案 D

解析本题考查固定搭配。on guard“守卫，警惕，提防”。句意为：一个国家必须时刻提防间谍和入侵者。

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