单选题On hearing the fire signal, the crew should carry out their assigned duties immediately.（）A在听到火警信号后，船员应立即履行他们分配的职责。B在听到火警信号后，船员应立即分配他们的职责。C在听到火警信号前，船员应立即分配他们的职责。D在听到火警信号前，船员应立即履行他们分配的职责。
单选题
On hearing the fire signal, the crew should carry out their assigned duties immediately.（）
A
在听到火警信号后，船员应立即履行他们分配的职责。
B
在听到火警信号后，船员应立即分配他们的职责。
C
在听到火警信号前，船员应立即分配他们的职责。
D
在听到火警信号前，船员应立即履行他们分配的职责。
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