There are some new dictionaries on that shelf.They ______a few weeks ago.A.buy B.bought
题目
There are some new dictionaries on that shelf.They ______a few weeks ago.A.buy B.bought
C.were bought D.have bought知道选C,为什么
答案
这些dictionaries是被买来的,所以是be bought.是过去几周前买的,所以是was
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
最新试题
热门考点