Tom often does his homework after class 改为一般疑问句 Does Tom often do his homework after class
题目
Tom often does his homework after class 改为一般疑问句 Does Tom often do his homework after class
often 要加吗?
答案
要加啊,原意中有often来表频率,问句中也要体现出来
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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