两个句子：1.It seemed as if the world was at an end.2.If he were here,everything would be all right.可以确定两
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两个句子：1.It seemed as if the world was at an end.2.If he were here,everything would be all right.可以确定两个句子都准确无误,第一句取自教科书.所以,虚拟语气中was 和were的用法有何不同,在什么样的情况下可以相互替代,在什么情况下又不可以相互替代?哪些情况下可以用was
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举一反三
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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