【題目】The heavyweight champion is fighting an unknown c(對手).

【答案】competitor
【解析】句意:這位重量級冠軍正在和一位不知名的對手打斗。 competitor名詞,“對手,競爭者”,根據(jù)前面的不定冠詞an,故填單數(shù)。所以答案為competitor。

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