Quite a few tall buildings _______ the last two years.
题目
Quite a few tall buildings _______ the last two years.
A.have been put up B.were put up
C.had put up D.put up
选什么、理由是
答案
A
最近两年一些高楼被建起,典型的现在完成时"the last two years",对现在有影响
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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