___ there any elephants in the zoo last year? No.there ___ , but there ___ some now.
题目
___ there any elephants in the zoo last year? No.there ___ , but there ___ some now.
A.Are ,aren't ,are B.Was ,wasn't ,are C,Were,weren't ,were D,Were,weren't,are 翻译并语法说明
答案
D
去年动物园里有大象吗?没有.但现在有了.
注意时态就行了.
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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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