We have had a telephone message from your father ___ us that he was on the train.
题目
We have had a telephone message from your father ___ us that he was on the train.
为什么空格处用"telling "而加上"that"之后又变成"told"了呢?这和动名词作主语有关吗?请用语法知识回答,
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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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