they need help ( ) their school trip a.in b.out c.on d.for
题目
they need help ( ) their school trip a.in b.out c.on d.for
答案
d.for
need help for sth.
因为某事需要帮助.
need help for sth.做某事需要帮助;
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
最新试题
热门考点