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 题目和参考答案——青夏教育精英家教网—

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

解析试题分析：句意：谢尔顿本可以在比赛中打败霍华德的，但是他却在最后一分钟掉以轻心了。由could have defeated可知道是对过去的推测，所以用过去时。故B正确
考点：考查时态

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