must have done 表示肯定做了某事 ,是对于过去情况的肯定推测.凡是对于过去情况的推测,结构都是 情态动词的过去式+ have done 结构.must have been doing表示过去肯定正在做某事
英语语法Past form=modal+have+P.PCountinuous form=modal+be+ing那mu
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