题目内容
2．当你听到火警警报时，应立刻离开．You should leaveat once/right now/immediatelywhen you hear the fire alarm．
分析 at once/right now/immediately
解答 答案：at once/right now/immediately．
首先通过中英文句子的比对，可知英文句子中缺少"立刻"的表达．"立刻"的英文表达是：at once/right now/immediately．本题中，故答案为：at once/right now/immediately
点评 做这类题型，首先根据所给汉语明确句子所要考查的单词或短语的拼写，再结合相关语法知识对单词或短语做出形式上的变化．
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