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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

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

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

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

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