求英语帝 2、Not having received a reply,he decided to write again.没有收到回复,他...
题目
求英语帝 2、Not having received a reply,he decided to write again.没有收到回复,他...
求英语帝 2、Not having received a reply,he decided to write again.没有收到回复,他决定再写一封.having .这里听说是动名词 ,这是为什么?不能换成because had not received a...
答案
动名词表原因,由于没有收到回复,他决定再写一封.
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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