Question

【题目】I ________ more careful in that quiz. I made too many stupid mistakes.

A. must be B. could have been

C. must have been D. could be

Answer 1

【答案】B

【解析】

考查情态动词。句意：在那次测验中我本可以更加仔细。我犯了太多愚蠢的错误了。这里用could have done表示未曾实现的能力，即表示过去本来有能力可以做某事的，但实际上没有那样去做，通常译为“本来可以”“本来能力”等；must have done是对过去发生的动作最有把握的猜测，意思是“一定”。故选B。