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(tài)動詞+have done的用法 句意為：當(dāng)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(fā)生。在英語中，我們對過去的推測，常使用情態(tài)動詞（not）+have done 結(jié)構(gòu)，故選 A

考點：考查情態(tài)動詞+have done的用法。

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