The reason ___ he missed school this morning was ___ he had to look after his sick mother.
题目
The reason ___ he missed school this morning was ___ he had to look after his sick mother.
A why that
B because why
C that because
D which that
说明理由
答案
A
The reason why.is that.
之所以.是因为.
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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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