题目内容
3．It isimpossible（possible） to improve our English without enough practice．分析 翻译：没有足够的练习提高我们的英语是不可能的
解答 此句中，it为形式主语，不定式短语to improve our English为真正的主语．而without enough practice为介宾短语做条件状语．没有足够的练习，不可能提高我们的英语，要用possible的反义词．故答案为：impossible
点评 本题考查表语．句子的结构是主系表，it在句中是形式主语，真正的主语是后面的to do不定式短语．
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