—How long in Shanghai？
—Just the weekend. I've 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
网友回答
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。