We were _when he called for me this morning.
题目
We were _when he called for me this morning.
选填A.at the brakfast B.having a breakfast C.at breakfast D.having the breakfast
答案
选C
A,B,D：breakfast前不加the或a
C.at breakfast在吃早餐,无语法错误.
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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