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(2013·吉林长春高中毕业班第一次调研)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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