They ______ at the hotel in less than half an hour after their arrival at the airport.

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问题 They ______ at the hotel in less than half an hour after their arrival at the airport.

选项 A、checked out
B、checked on
C、checked up
D、checked in

答案D

解析 check in在旅馆登记。check out付账后离开。check up检查。check on检查,核对。  
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