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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