【題目】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

【答案】B

【解析】

考查情態(tài)動(dòng)詞。句意：在那次測(cè)驗(yàn)中我本可以更加仔細(xì)。我犯了太多愚蠢的錯(cuò)誤了。這里用could have done表示未曾實(shí)現(xiàn)的能力，即表示過去本來有能力可以做某事的，但實(shí)際上沒有那樣去做，通常譯為“本來可以”“本來能力”等；must have done是對(duì)過去發(fā)生的動(dòng)作最有把握的猜測(cè)，意思是“一定”。故選B。

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