It will be very (help)_if each member presents his or her own opinion at the meeting
题目
It will be very (help)_if each member presents his or her own opinion at the meeting
答案
helpful,如果会议上的每个成员都发表意见,那将会很有帮助.
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
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