1.(are you doing) anything interesting this weekend?可以写成did you do anything interesting this weekend?2.going on意思3.为什么香港可以50年不变?

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Are you doing an experment 哪里错 what are you doing? What are you doing? what are you doing What are you doing? WHAT ARE YOU DOING? you are doing How are you doing? what are you doing? How are you doing? How are you doing? where are you doing? where are you doing How are you doing? how are you doing You need to ask some questions when you are doing an i___? what shoulde you do when you are doing first aid for someone injured in an accident 翻译Tell them what you are doing an why you are doing so to make them understand you 诚实是最好的方