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Our duty is to ______ their country against both domestic and foreign enemies’ attack.

A.delayB. defendC.defeatD.depend

B

解析试题分析:句意:我们的责任是保卫其国家反对国内外敌人的攻击。A. delay延迟,拖延,耽搁;B. defend保卫;C. defeat 击败;D. depend依赖,依靠。由题干内容可判断B正确。
考点: 考查动词的辨析。

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