As the immune system weakens, it loses the ability ________ illnesses.
A．fightingB．fought
C．to fightD．to be fought
C
C　考查非謂語動(dòng)詞。句意：由于免疫系統(tǒng)衰退，它失去了與疾病抗?fàn)幍哪芰�。表示“……的能力”，要用不定式作后置定語來修飾the ability。
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