我要提问He is the only one of the stufents ___ a winner of scholarship for three years.A is B are
题目
我要提问He is the only one of the stufents ___ a winner of scholarship for three years.A is B are
C have been D has been 请问这道题的正确答案是哪一个
答案
D has been
the only one 表示单数
for three years.表明从过去延续到现在,用完成时
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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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