Jack could have avoided that terrible car accident, but he ________ careful enough. A．is not..
Jackcouldhaveavoidedthatterriblecaraccident,buthe________carefulenough.A．isnotB．hasn’...
Jack could have avoided that terrible car accident, but he ________ careful enough. A．is not B．hasn’t been C．was not D．hadn’t been
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| C |
| 这题考查时态，句意是：杰克本来可以避免这场可怕的车祸，但是他太不仔细了。从could have done看出是“过去本可以做…却没有做”，那不够仔细是过去的事实，所以选C |
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