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• vacation,riding,bike,with,l,my,family,am,on,going.
• National Day is coming. I’m very happy because I can relax myself during the vacation.I’m going to Beijingfor vacation with my parents. We are leaving forBeijingon 29th of September. We are going there by plane. We are staying there for about 5 days. During the five days. We will visit the Great wall, thePalaceMuseum, theSummberPalaceso on. I am planning to go bike riding with my father. My mother likes shopping. So I’m going shopping with my mother.
• vacation,riding,bike,with,l,my,family,am,on,going.
• 原核细胞的ATP主要是在线粒体内产生的,
• I ____ bike riding for vacation A.went B.am going C.goesD.go 选哪个为什么