英语翻译
题目
英语翻译
1.当他到达剧院时,票已经卖光了
2.当他回家时,电视已经被关了
3.在我拿书包以前,我把门关了（用before)
4.在他做完作业前,他爸爸回来了
答案
1.When he arrived the threat, tickets had been sold out.2.When he returned home, the TV had been turned off.3.I had closed door before I took my bag.4.His father had returned before he finished his wo...
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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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