Once lost,_____.
题目
Once lost,_____.
A.it is hard to get such a chance again
B.one can never get such a chance again
C.to get such a chance is difficult
D.such a chance might never come again
WHY CHOOSE
答案
once引导时间状语从句,主从句主语一致,切当从句谓语动词为be动词时才可省略从句中的主语和谓语动词,所以从句补全就是,Once the chance is lost,
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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