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The self-driving plane proves to be usef...

The self-driving plane proves to be useful in many ways. ____ smart invention it is!

A.What a B.How a C.What D.How

 

A 【解析】 句意:事实证明,自动驾驶飞机在许多方面都很有用。这是多么聪明的发明啊! 考查感叹句。在感叹句中,what修饰名词,how修饰形容词/副词,根据smart invention it is可知句型结构为:What +a/an+形容词+单数名词+主语+谓语动词! smart 以辅音音素开头,不定冠词用a。故选A。
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