The boss____________ the worker how to do it, or the accident couldn"t have happ
题型：不详难度：来源：
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 |
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答案
| A |
解析
| 抓住关键“or”，意为“否则”，所以前后意思相反。 |
举一反三
―Why? Where is the key to the sound lab?
―Dear me! You _______ it in the taxi！| A．have never left | B．never left | | C．haven’t left | D．didn’t leave |
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— I ____ to your birthday party last Sunday.
— Unfortunately, you were out on business.| A．had come | B．came | C．would come | D．would have come |
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_______ which way to take, the little boy behaved like a real gentleman who comforted his sister from time to time.| A．Leaving to wonder | B．Having left to wonder | | C．Left wondering | D．Left to wonder |
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