题目内容
18.My neighbors usually feed those homeless catstwice a day.(two)分析 我的邻居们通常一天喂两次那些流浪猫.
解答 答案:twice.这里是一般现在时,放在句末的,是表示频率的,根据所给单词two及a day可知这里是说一天两次,用twice,故答案是twice.
点评 表示次数的词基本上都是基数词后加上times,比如three times,只有once表示一次,twice表示两次.
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