UPUPEX(upupoo动态桌面壁纸)

新编英语语法教程 第21讲 练习参考答案 1 going 2 to murder 3 putting 4 to explain， to understand， to say 5 going 6 wondering， going 7 being 8 biting 9 going， to appreciate， to start 10 working， spending 11 to learn， saying 12 to put， to prevent。