—Hi, John, I have not seen you for a lon
问题:
—Hi, John, I have not seen you for a long time. What _______ recently? —Carrying on some research on wildlife. |
A. have you been doing B. have you done C. were you doing D. did you do |
—Hi, John, I have not seen you for a long time. What _______ recently? —Carrying on some research on wildlife. |
A. have you been doing B. have you done C. were you doing D. did you do |