问题
选择题
Glad to see you back. How long _____ in Russia? [ ]
A. did you stay
B. have you stayed
C. were you staying
D. have you been staying
答案
答案：A
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Glad to see you back. How long _____ in Russia? [ ]
A. did you stay
B. have you stayed
C. were you staying
D. have you been staying
答案：A