Choose the best answer which can plete the sentence.Mary, you really ________ without a word. We were anxious about you.A.can't have goneB.needn't have goneC.shouldn't have goneD.mustn't have gone
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C解析本题考查的是情态动词+have done的用法．其中can't have done的意思是“不可能做过了某事”，needn't have done“不必做某事（而做了）”，shouldn't have done“本不应做某事（而做了）”mustn't have done是一种不存在的表达方式．根据题干的含义是对Mary的一种责备，说明她不该做的事情而做了．因此