二、单项填空（每小题1分，满分10分）
21. —Who will go to the airport to meet Mary?
—I will. I her several times. I can find her easily.
A. met B. have met C. had met D. will meet
22. We each other since I left school.
A. don’t see B. didn’t see
C. haven’t see D. haven’t seen
23 —Where have you _________? —I’ve ________ the supermarket.
A. gone, gone to B. been, been to C. gone, been at D. been, gone to
