If Mary ____ enough money,she would buy the the beautiful dress.A get B has C had D had had
题目
If Mary ____ enough money,she would buy the the beautiful dress.A get B has C had D had had
答案
C had
she would buy the the beautiful dress
与现在事实相反,
所以,前面是假设,事实上并没有足够钱.
要用虚拟.
C had
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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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