The boss the workers how to do it, or the accident couldn’t have happened.A. can’t have told B. ought to tellC. could have told D. mustn’t have told 题目和参考答案——青夏教育精英家教网—

题目内容

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

【解析】

试题分析：考查情态动词+have done的用法句意为：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：考查情态动词+have done的用法。

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