改错 1.they have gone to beijing twice this year.2.i hear that one of the students have come back
问题描述：
改错 1.they have gone to beijing twice this year.2.i hear that one of the students have come back
答
1，gone 改为been
2 , have 改为has
答
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