He realized she was crying__ what he had said a,because b,because of 为什么,具体点,：】
题目
He realized she was crying__ what he had said a,because b,because of 为什么,具体点,：】
答案
B ,because 作为连词后面是一个完整的句子.what he had said 作为一个单词,作为宾语
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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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