---Excuse me ,Is this seat taken?---_________,the man got his book and left a few minutes ago .
题目
---Excuse me ,Is this seat taken?---_________,the man got his book and left a few minutes ago .
A,I am afaid so B.I don't think so C.I don't know D.I hope so
答案
我觉得应该选C,但如果没有选项的话,我选I'm not sure.
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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