Question

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

Answer 1

B

试题分析： 句意：Sheldon本可以在比赛中打败 Howard的，但是他最后一分钟太粗心了。前面的could have defeated是对过去情况的虚拟，but后面的内容是过去的事实，用一般过去式，所以选B。