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20．We bought a special program in order to help the computer recognize our voice．（對劃線部分提問）
Why did youbuy a special program？

分析 --我們買了一個特殊的程序為了幫助電腦識別我們的聲音．
--為什么你買一個特殊的程序？

解答答案：Why；buy．考查對劃線部分提問．句意"--我們買了一個特殊的程序為了幫助電腦識別我們的聲音．--為什么你買一個特殊的程序？"．in order to為了…表示目的，因此應該用疑問詞why提問．剩下的變為一般疑問句，實義動詞bought變為原形buy．答案是Why；buy．

點評對劃線部分提問，要根據劃線部分內容選擇合適的疑問詞，剩下的變為一般疑問句．注意區分疑問詞的用法．會正確運用一般疑問句用法．

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