改错 1.they have gone to beijing twice this year.2.i hear that one of the students have come back
题目
改错 1.they have gone to beijing twice this year.2.i hear that one of the students have come back
答案
1 have gone 改成have been,因为去过2次,已经回来了,用have been to
2 have改成has,因为one of ,是一位,单数概念,因此谓语用单数
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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