题目内容
The robot can help me sweep the floor. smart invention it is!
| A．What | B．What a |
| C．What an | D．How |
B
解析试题分析：感叹句主要有what和how构成：
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！
根据smart invention it is可知选B。
考点：考查感叹句
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