题目内容
4．-Look!_________ clean the classroom looks!-Yes．I'm sure somebody _______ it up．（ ）
| A． | What； has cleaned | B． | How； has cleaned | ||
| C． | What； cleaned | D． | How； cleaned |
分析 ---看！教室看起来多么感干净啊！
---是的，我确定有人打扫了．
解答 答案：B．
英语中的感叹句要由what和how来引导，其句型是：How+形容词/副词+主语+谓语+其他!What+（a/an）+形容词+名词+主语+谓语+其他!根据所给的单词，形容词是clean，主语是the classroom，应用how来感叹，下文是表达的动作发生在过去，对现在造成一定的影响，故用现在完成时have/has+过去分词，主语somebody不定代词，故has，故答案是B．
点评 1、what修饰名词或名词短语，有以下两种形式：1．What+a（an）+（形容词）+单数可数名词+主语+谓语！或是：What+名词词组+主语+谓语！2．What+（形容词）+可数名词复数或不可数名词+主语+谓语！
2、How引导的感叹句． how用来修饰形容词、副词或动词．其结构是：How+形容词（副词）+主语+谓语！
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