His illness made him ______ of concentration.

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问题 His illness made him ______ of concentration.

选项 A、incompetent
B、unable
C、incapable
D、powerless

答案C

解析 C incapable意为“无能力的,不能上任的”,后接of,故为答案。而A incompetent意为“不称职的,无能力的”,B unable意为“无法的,不能的”;后接动词不定式,D powerless意为“无能的,无力量的,无权力的”,都与题意不符,故排除。
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