As the immune system weakens, it loses the ability ________ illnesses.

A．fighting B．fought

C．to fight D．to be fought

 

C

【解析】C　考查非謂語動詞。句意：由于免疫系統(tǒng)衰退，它失去了與疾病抗?fàn)幍哪芰Α１硎尽啊哪芰Α�，要用不定式作后置定語來修飾the ability。

 

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