Glad to see you back. How long in Russia?A. did you stayB. have you stayedC. were you stay

问题补充：

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. did you stay

B. have you stayed

C. were you staying

D. have you been staying

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