【用戶】Pei
【年級】大一上
【評論內容】Mary ____ have forgotten to water the plants while we were on vacation because they are all dead now. (A) must (B) would (C) should (D) maybe
【用戶】shuweichang
【年級】大三下
【評論內容】本題在考文法：對過去事實的肯定猜測：表"過去必定..."、"過去可能..."S + must/could/may/might + have + p.p e.g. She must have been in the library. (她當時一定是在圖書館。) She could/may/might have been in the library. (她當時可能是在圖書館。)