题文
（2014届陕西省西工大附中高三第七次适应性训练 ）
Sheldon could have defeated Howard in the match, but he _______ too careless at the last minute.
| A．is | B．was | C．has been | D．had been |
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（2014届陕西省西工大附中高三第七次适应性训练 ）
Sheldon could have defeated Howard in the match, but he _______ too careless at the last minute.
| A．is | B．was | C．has been | D．had been |
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