明天交
题目
明天交
He was so happy that he could't say a word when he heard the news.(保持原句意思）
He was ______ happy ________ say a word when he heard the news.
答案
He was too happy to say a word when he heard the news.
很简单,用too...to...换so...that...
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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