问题补充：
----Glad to see you back! How long you in Europe?
----Three months. I’m off to South Africa next week.
A. have; stayed
B. had; stayed
C. will; stay
D. did; stay
答案：
A. have; stayed
B. had; stayed
C. will; stay
(答案→)D. did; stay
解析：考查时态。根据Glad to see you back!可知已经回来，故“在欧洲呆了多长时间”为一般过去时。句意：——很高兴看到你回来了！在欧洲呆了多长时间？——3个月，下个周我要去南非。
