解析 【解析】【答案】boil; boils 【解析】本题结合句意,后面是when引导的时间 状语从句,从句中water是第三人称单数,且由主 句happens可知时态为一般现在时,故从句时态也 为一般现在时,boil动词,煮沸,沸腾,这里要用 第三人称单数boils。故本题答案为boil;boils。
【解析】boil 作动词,表示沸腾,煮沸;A to boil 不定式形式;B boiling 现在分词形式;C will boil 将来时;D boils 主语是第三人称单数形式;根据句意,水沸腾是一种客观现象,所以句子时态是一般现在时。水是主动发生了沸腾boil这个工作,并且“water(水)”是不可数名词作主语,故用单数第三人称的谓语动词形式。...
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