I / have / toothache / so / I / have to / see / dentist I have a toothache so12/15I / have / toothache / so / I / have to / see / dentist.I have a toothache so I have to see dentist.I have toothache so I have to see dentist.I have a toothache, so I have to see the dentist.I have toothaches so I have to see the dentists.Giải thíchĐáp án: C Dịch nghĩa: Tôi bị đau răng nên tôi phải đến nha sĩ.