空格 we were in beijinglibrary that day; a :it happened that; b:it was happened that
题目
空格 we were in beijinglibrary that day; a :it happened that; b:it was happened that
如果b改成it was happening that;
答案
it happened that 从句（碰巧.）是一个固定句型,这个句型中主句不用进行时.
但可以说sth is happening(发生）
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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