he asked his doctor to tell him whether his operation had been successful
题目
he asked his doctor to tell him whether his operation had been successful
he asked his doctor to tell him whether his operation was successful
请问这句用一般过去时代替过去完成时可以吗?为什么?是语法不可以,还是语意不通?
答案
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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