His inability to speak English puts him at a ________ When he attends international conferences. A.advantageB.disadvantageC.disadvantageousD.disadvantaging
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B解析题意：他不会讲英语，使他在参加国际会议时处于不利的情况。at a disadvantage处于不利的地位。A项不符合题意，C项是形容词形式，D项是v. -ing形式，不是正确结构。