Mr Lee, who___as a carpenter for over 10 years, is now a very stateman in this country.
题目
Mr Lee, who___as a carpenter for over 10 years, is now a very stateman in this country.
选has worked 还是worked?为什么?
答案
用 has worked
因为for 后10年是一段时间,是完成时标志.
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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