I (have) this watch for three years.
题目
I (have) this watch for three years.
The Blacks (sit) at table when I came.
He tried to find a seat (have) a rest
答案
1.have had
2.were sitting(The Blacks指一家人,故用复数)
3.to have
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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