单项选择题

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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