Ray：__________．Where was I? Brenda：You were talking about your nip to South Africa．

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问题 Ray：__________．Where was I?
Brenda：You were talking about your nip to South Africa．

选项 A、Let，s back up．
B、What did I hear?
C、Let，s check in．
D、What were you talking about?

答案A

解析 back这里作动词。back up意为“倒退”；这里引申为“回顾一下”；check jn登记，报到，很容易排除。这个短语在酒店常用，相反check out就是退房。其他选项都不能在这个语境中使用。故答案为A。

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GCT工程硕士（英语）

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