It’s our duty to ________ our country when it is attacked by the enemy.

A．guard 　　　 B．protect 　　 C．prevent 　　　D．defend

 

D

考查近義詞辨析。句意為：當國家受到敵人襲擊時，保衛(wèi)我們的國家是我們的義務。guard看守；守衛(wèi)，強調(diào)看守或戒備；protect保護，強調(diào)提供某種障礙物以免受損害；prevent阻止，強調(diào)阻止某事發(fā)生；defend保衛(wèi)；防御，強調(diào)用武力或其他手段抵御來自外界的危險或攻擊。只有D項符合句意。

 

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