哪个高手能帮我回答下下面的英语问题吗?
题目
哪个高手能帮我回答下下面的英语问题吗?
改写下列的句子,用must 或 have to 来替代黑体印出的部分. It is necessary for you to work hard You must (or have to )work hard. 1 it will be necessary for you to see a doctor 2 Is it necessary for your to make so much noise ? 3 she said it would be necessary for us to stay here. 4 it is necessary for me to have some help 5 it was necessary for him to go out last night
答案
1.You must see a doctor.2.Do you have to make so much noise?3.She said that we had to stay here.4.I must have some help.5.He had to go out last night.
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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