問題詳情：
As the immune system weakens，it loses the ability ________ illnesses.
A．fighting B．fought
C．to fight D．to be fought
【回答】
C [考查非謂語動詞。句意：由於免疫系統減弱，它失去了與疾病抗爭的能力。表示“……的能力”，要用動詞不定式作後置定語來修飾the ability。]
知識點：非謂語動詞
題型：選擇題
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