When I was a child ,I lived with my mother
题目
When I was a child ,I lived with my mother
When I was a child,I lived with my mother,my father having been away to work in the town.
1.问此句,为什么用having been?
2.my father having been away to work in the town.该如何翻译?是什么时态?请说出这句的主谓宾?
答案
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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