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The boss _____ the workers how to do it, or the accident couldn’t have happened.

A. can’t have told B. ought to tell

C. could have told D. mustn’t have told

A

【解析】

試題分析:考查情態動詞+have done的用法 句意為:當時老板不可能告訴工人如何做這件事(是對過去的推測),否則這個事故不可能發生。在英語中,我們對過去的推測,常使用情態動詞(not)+have done 結構,故選 A

考點:考查情態動詞+have done的用法。

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