---Has your father returned from Africa yet? ---Yes,but he_here for only three days before his
题目
---Has your father returned from Africa yet? ---Yes,but he_here for only three days before his
company sent him to Australia.
A.was B.has been C.will be D.would be
该题选择A.我的疑问是既然有 for+一段时间 为什么不用完成时,为什么不选B
十分感谢~~~
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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