The classroon is so clean.Someone---(could/must)clean it just now.

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• The classroon is so clean.Someone---(could/must)clean it just now.
• The classroom is so clean,Someone __must____ clean it just now.为什么用must.just now是表过去啊
• The classroon is so clean.Someone---(could/must)clean it just now.
• why do you so quiet today 为什么你今天如此安静?I will accept it if you could give me!如果你愿意给我的话我会欣然接受的.please take easy if you want to occupy his attention!放轻松 如果你想吸引他注意的话.I have to leave advance.我不得不提前走.He will appear!他会出现的.I appreciare the picture very much!我很欣赏这幅画!I am arranging a meeting now.我正在筹备一场会议.I must arrange with you about the question 这个问题我必须和你商量.I feeled he never attention for me.我觉得他从不为我考虑.just in case （请翻议下?）he is my company .他是我的同事.I will confir
• The classroom is so clean,Someone __must____ clean it just now.为什么用must.just now是表过去啊
• there is a lamp on my
• 把Must we clean the classroom now?改成否定回答