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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,我们听不见他们在谈论什么.

解答 答案是D.本题考查情态动词辨析.mustn't 禁止; didn't have to不必; ought not to不应该; couldn't不能;由句中的so noisy推断是"不能听见",所以答案选择D.

点评 首先理解各情态动词的基本用法,整体把握语境中的情感态度,最后做出合理的判断.

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