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

游客2025-03-04 40

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。

转载请注明原文地址:https://tihaiku.com/zcyy/3981906.html

相关试题推荐

随机试题

最新回复(0)

Theeducationof________youngisalways________hotandserioustopic.A、/,/B、the