—Haven't seen you for ages!Where have you been?—I went to Ningxia and there for one year,teaching as a volunteer.A.stayed B.stay C.had stayed D.am staying

—Haven't seen you for ages!Where have you been?—I went to Ningxia and there for one year,teaching as a volunteer.A.stayed B.stay C.had stayed D.am staying
—Haven't seen you for ages!Where have you been?
—I went to Ningxia and there for one year,teaching as a volunteer.
A.stayed B.stay C.had stayed D.am staying

—Haven't seen you for ages!Where have you been?—I went to Ningxia and there for one year,teaching as a volunteer.A.stayed B.stay C.had stayed D.am staying
a