___useful invention the computer is!A:What a B:What an C:How

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___useful invention the computer is!A:What a B:What an C:How a D:How an
选A还是C,请说明下原因
how + 形容词、副词+主语+谓语,
How a useful invention the computer is!

选A
how + 形容词、副词+主语+谓语,所以排除 C, D

因为useful是辅音开头的单词,所以用a修饰
再问： how + 形容词、副词+主语+谓语,这表示是什么意思？ How a useful invention the computer is! 是什么意思
再答： how + 形容词、副词+主语+谓语,这表示是一个固定的句型 How a useful invention the computer is! 意思是电脑是一样多么有用的发明啊

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