Anything that involves （）on what he is doing is anathema to him.Aconcentrate Bconcentrating Cto concentate.Dconcentrated. 英语
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【答案】 B concentrating
Anything that involves (concentrating on what he is doing) is anathema to him
involves 要接名词/名词短语/名词从句
括号内是名词从句.