分别用四种英语时态造一般,否定,疑问3个句子!
题目
分别用四种英语时态造一般,否定,疑问3个句子!
答案
现在进行时He is doing his homework.He is not doing his homework.Is he doing his homework?一般时He does his homework.He doesn't do his homework.Does he do his homework?将来时He will do his homework.He ...
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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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