The students didn’t manage to work out the problem ______ their teacher had explained how.
题目
The students didn’t manage to work out the problem ______ their teacher had explained how.
A. when B. until C. unless D. as
1. Some people think ______ about their rights than about their duties.
A. too much B. as much C. much more D. many more
答案
B
C
原因自己想
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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