they have gone shopping是不是去了还没回来,如果回来了是否得改成they have been to go shopping?
题目
they have gone shopping是不是去了还没回来,如果回来了是否得改成they have been to go shopping?
答案
对的
但they have been to go shopping好像不太通,直接they have been to shop
仅个人意见
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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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