【題目】________ 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“凱蒂為老人打出租車而設(shè)計的應(yīng)用程序多么地有用啊”。本題考察感嘆句,useful修飾可數(shù)名詞app,即“what+a/an+adj+可數(shù)名詞單數(shù)+主語+謂語”。且useful為輔音音標(biāo)開頭,用what a,故選B。

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