could you tell me ( )? what are they doing that for, why they are doing for ,
题目
could you tell me ( )? what are they doing that for, why they are doing for ,
why are they doing that, what they are doing that for 为什么选d
答案
因为是要带从句,所以what are they doing that fo 和 why are they doing that是错的,要用陈述语序.why提问原因,不能与for搭配,只能选what they are doing that for
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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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