改错 1.they have gone to beijing twice this year.2.i hear that one of the students have come back

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改错 1.they have gone to beijing twice this year.2.i hear that one of the students have come back

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

1,gone 改为been
2 , have 改为has