when i call you this morning,nobody answer the phone. where____? 答案填were you,为什么...
题目
when i call you this morning,nobody answer the phone. where____? 答案填were you,为什么...
when i call you this morning,nobody answer the phone. where____? 答案填were you,为什么不可以写did you go.?
答案
因为到某地去已经回来了的要说where have you been?(你到哪里去了?而不是did you go)、Where were you?(你刚才在那里)
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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