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【题目】We can pay money by scanning QR(扫二维码). ________________ convenient invention it is!

A.What aB.WhatC.HowD.How a

【答案】A

【解析】

句意:我们可以通过扫二维码支付。多么方便的发明啊!

考查感叹句。根据感叹句的结构:How +形容词/副词+主语+谓语!/What +a/an+形容词+单数名词+主语+谓语!/What+形容词+不可数名词/复数名词+主语+谓语!和句子的结构可知这里是感叹convenient invention,是单数可数名词,应该用what a,故选A

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