20．It was so noisy outside that we ____________ hear what they were talking about．（　　）
A．mustn'tB．didn't have toC．ought not toD．couldn't

分析 外面如此的吵，我們聽不見他們在談論什么．

解答 答案是D．本題考查情態(tài)動詞辨析．mustn't 禁止； didn't have to不必； ought not to不應該； couldn't不能；由句中的so noisy推斷是"不能聽見"，所以答案選擇D．

點評 首先理解各情態(tài)動詞的基本用法，整體把握語境中的情感態(tài)度，最后做出合理的判斷．

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