单项选择题
（） in the engine room, the motormen could hardly talk each other.
A.To work
B.Working
C.Having worked
D.worked
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A.to discharge
B.to be discharged
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A.to send
B.to be sent
C.for being sent
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It is well known that the whole power distribution of the ship’s electrical services mainly depend on the（）.
A.sub-boards
B.main switchboards
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