to make our city more beautiful
题目
to make our city more beautiful
A a lot of trees have been planted B it's necessary to plant a lot of trees C a lot of trees need planting D we have planted a lot of trees
答案
选择D
这里主要是考察独立主格结构,前面省略了主语,应该是和后面主句的主语一样,to make的主语是人,人为了是城市更美好,所以后面的主语是人,选择D
举一反三
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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