The food in the fridge _____ by my mother.It is good!
题目
The food in the fridge _____ by my mother.It is good!
A is cooking;agree on B was cooked;agree with C is cooked ;agree on D has cooked;agree with
给出原因 废话不选 漏答不选
答案
C 被动语态 时态根据后面应该为现在时
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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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