题目

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 由前句可知，“You”已回来了（不在俄罗斯），那么“You”在俄罗斯呆了多久是指过去的时间。

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