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

A．can’t have toldB．ought to tellC．could have toldD．mustn’t have told

A

解析試題分析: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(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：考察情態(tài)動詞+have done的用法。
點評：情態(tài)動詞對中國學(xué)生來講是一個難點，而情態(tài)動詞＋have done（表對過去的一種推測）更是一個難點和重點，學(xué)生要注意區(qū)別。

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