The two friends were (so) pleased to see each other that they talked on and on happily
题目
The two friends were (so) pleased to see each other that they talked on and on happily
in the park 原因
答案
so+形容词/副词+that+从句
固定搭配
如此.以致.
too...to...也是固定搭配
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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