It must be Mary's.Mary‘s到底是名词还是形容词性的所有格?换成“她”该怎么填?

It must be Mary's.Mary‘s到底是名词还是形容词性的所有格?换成“她”该怎么填? It must be she‘s 还是 hers? --Whose notebook is this? --It must be______.A.Mary B.Marys C.Marys ' D.Mary's There's someone outside.Who ___it be?There's someone outside.Who ___it be?It must be Mary.She promised to come here over at 8:00.A:must B:can C:shall D:need为什么? See who's there!Can it be Mary?See who's there!____it be Mary?a.may b.must c.can d.will这题答案为什么选C不选D呢? If it is not yours ,____ the beautiful skirt on that big desk be Mary's?A can B may C must D should .It’s not here .It must be _____ ( anywhere ) there —Is this Li Ping's watch,Mary?—I don't think so.It must be( ).A.anyone's else B.anyone else's C.someone's else D.someone else's —Is this Li Ping's watch,Mary?—I don't think so.It must be( )A.anyone's else B.anyone else's C.someone's else D.someone else's理由 who is that?it must be Mary.为什么不能用she? See who is there!＿it be Mary A May B must C can D will I knew Tom's bicycle .It must be ______(she) It's ___(ice).We must be careful. He thinks it must be his friend's house.是什么意思? That must be what it's all about.中文翻译 You must be careful to c_the road.It's dangerous. 用can,must,can't,mustn't填空1.The children ____ play on the road.It's very dangerous.2.---____ you skate on real ice?---Yes,I can.It's easy.3.---Who's that girl?---It ____ be Mary.Mary has gone to Beijing.4.As students,we ____ work hard at school. It Must Be?歌词