the teacher are talking with his students.they are talking about the jobs.这里的talk为什么加ing
题目
the teacher are talking with his students.they are talking about the jobs.这里的talk为什么加ing
答案
因为前面的句子用的是进行时态
the teacher are talking with his students.they are talking about the jobs
老师正在和学生谈话,他们谈的是工作.（此处talking表示他们正在谈,谈的内容是工作jobs）
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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