Passengers may retrieve their items from the overhead locker ______ the safety belt sign has been switched off.

admin2012-04-26  30

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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