问题补充：
—How long in Shanghai？
—Just the weekend. Ive to be back for an important meeting to be held next Monday.
A. have you stayed
B. are you staying
C. did you stay
D. do you stay
答案：
A. have you stayed
(答案→)B. are you staying
C. did you stay
D. do you stay
解析：可联系答.案.网客服索取。
