题目内容

The manager ______ the worker how to do it, or the accident couldn’t have happened.
A．couldn’t have toldB．ought to tell
C．could have toldD．mustn’t have told
A
考查情态动词的用法：    A. couldn’t have told过去不可能告诉了，B. ought to tell应该告诉      C. could have told本可以告诉却没有告诉，D. must接完成式不用否定，句意是：经理不可能告诉工人怎么做的，否则事故就不会发生了。选A。
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