单项选择:Mary told me that she()morning exercises every day A does B have done C will do D is doing 此题选A
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单项选择:Mary told me that she()morning exercises every day A does B have done C will do D is doing 此题选A,不过我想要错因
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介绍客观事实,用一般现在时
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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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