lots of people from all over the world are looking forward to ___the shanghai World Expo.
题目
lots of people from all over the world are looking forward to ___the shanghai World Expo.
A will visit
B visited
C visit
D visiting
答案
D visiting ;
look forward to doing sth:期待做某事,to是介词,所以动词加上ing；
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已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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