题目内容
7.Now the pollution problem in some areashas become (become) worse and worse.分析 现在在一些地区的污染问题越来越严重.
解答 答案:has become 考查单词填空.根据句意:现在在一些地区的污染问题越来越严重.强调表示过去发生的动作对现在造成的影响或结果或表示过去的动作或状态持续到现在.要用现在完成时,它的构成是:主语+have/has+动词的过去分词.主语the pollution problem是单数,故助动词用has,become的过去分词是become.故答案是has become.
点评 解答此题的关键是根据语境推测要填内容表达的含义,然后能理解各选项内容,有时可能没有必要细细区分每个单词的含义,仅根据句子语气就可以判断出正确答案.
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