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Passengers may retrieve their items from the overhead locker ______ the safety b
Passengers may retrieve their items from the overhead locker ______ the safety b
游客
2025-06-16
16
管理
问题
Passengers may retrieve their items from the overhead locker ______ the safety belt sign has been switched off.
选项
A、meanwhile
B、under
C、although
D、once
答案
D
解析
条件连词once(一旦……)
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