the shop was quite new, for it ----only the week before . A had opened B. Has been open
题目
the shop was quite new, for it ----only the week before . A had opened B. Has been open
C. was opening D is opened 为什么答案选A?
答案
因为根据语境,open这个动作发生在was这个动作之前,所以要用过去完成时态故选A
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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