The boss ______ the worker how to do it,...

The boss ______ the worker 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】试题分析:意为：当时老板不可能告诉工人如何做这件事（是对过去的推测），否则这个事故不可能发生。在英语中，我们对过去的推测，常使用情态动词（not）+have done 结构，故选 A 考点：考察情态动词+have done的用法。

考点分析：

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