2. 考研
  3. Ray: ______Where was I? Brenda: You were talking about your trip to South Africa.

Ray: ______Where was I? Brenda: You were talking about your trip to South Africa.

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问题 Ray: ______Where was I? Brenda: You were talking about your trip 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 in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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