用过去进行时和过去式的英语作文
题目
用过去进行时和过去式的英语作文
答案
过去进行时Last night,I was doing my homework when my father came back from work.And the radio was singing a happy song .Then we went out to find my monther.She was taking a walk leisurely by the lake ...
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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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