did not disturb him until he had fimished the work.但我认为We had nor disturb
题目
did not disturb him until he had fimished the work.但我认为We had nor disturb
him until he finished the work.为什么答案是前面那个呢?
答案
this sentence means:we disturbed him after he finished the work.so,we didn't disturb him until he finished the work.or,we didn't disturb him until he had finished the work.both are right.
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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