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    精英家教网 > 高中英语 > 题目详情
    As the immune system weakens, it loses the ability ________ illnesses.
    A．fightingB．fought
    C．to fightD．to be fought
    C
    C　考查非谓语动词。句意：由于免疫系统衰退，它失去了与疾病抗争的能力。表示“……的能力”，要用不定式作后置定语来修饰the ability。
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