单选题However, where immediate action is necessary to ensure safety of the ship, its machinery and crew, it must be taken by the engineer in chargeWhat dose “it” mean in the sentence above?()AsafetyBthe ship, its machinery and crewCimmediate actionDthe engineer in charge

单选题
However, where immediate action is necessary to ensure safety of the ship, its machinery and crew, it must be taken by the engineer in chargeWhat dose “it” mean in the sentence above?()
A

safety

B

the ship, its machinery and crew

C

immediate action

D

the engineer in charge


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