精英家教網 > 高中英語 > 題目詳情
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
考查情態(tài)動詞的用法：    A. couldn’t have told過去不可能告訴了，B. ought to tell應該告訴      C. could have told本可以告訴卻沒有告訴，D. must接完成式不用否定，句意是：經理不可能告訴工人怎么做的，否則事故就不會發(fā)生了。選A。
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