Student A: How long have you collected stamps? Student B: ______________Đoạn văn17/45Mark the letter A, B, C or D on your answer sheet to indicate the sentence that best completes each of the following exchanges. Student A: How long have you collected stamps? Student B: ______________ Five years ago.When I was in grade 5.For five years.Since I have free time.Giải thíchChọn C