2. 专升本
  3. Before the age of the Internet, we used to______our holidays through travel agents.

Before the age of the Internet, we used to______our holidays through travel agents.

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问题 Before the age of the Internet, we used to______our holidays through travel agents.
选项 A、book
B、having booked
C、booking
D、have booked
答案A
解析
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