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【题目】________ useful app Kitty designed for the old to call a taxi!

A. WhatB. What aC. What anD. How

【答案】B

【解析】

句意“凯蒂为老人打出租车而设计的应用程序多么地有用啊”。本题考察感叹句,useful修饰可数名词app,即“what+a/an+adj+可数名词单数+主语+谓语”。且useful为辅音音标开头,用what a,故选B

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