This is___heavy a box ___no one can lift it.
题目
This is___heavy a box ___no one can lift it.
答案是such as 还有几个问题
I cannot help ___ the work for him.He is breaking the law.
I cannot help ___ the work for him.He is too young to do it.
A.do B.to do C.doing D.A or B
感激不尽!
标题没有it
还有 fit的用法，fit和be fit for 有什么区别？
答案
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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