You can only be sure of __you have at present ;
题目
You can only be sure of __you have at present ;
you cannot be sure of something___you might get in the future.
A that;what B what;/ C which;that D / ;that
答案
b第一句宾语从句,第二句定语从句省略that
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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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