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A country must always be ________ guard against spies and invaders.A、inB、toC、w
A country must always be ________ guard against spies and invaders.A、inB、toC、w
游客
2024-01-19
47
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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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