独立主格结构的题
题目
独立主格结构的题
2、They--------,the meeting was held according to schedule
A、having all arrived B、arriving
C、all arrived D、have all arrived
3.All the task having been fulfilled ahead of time（提前完成了）,they decided to go on holiday for a week.
为什么用having
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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