Upon arrival at a port, a vessel is not allowed （） her ballast water, tanker washings or bilge water and other oily water at will.<br>A:to discharge<br>B:to be discharged<br>C:discharging<br>D:being discharged

Upon arrival at a port, a vessel is not allowed （） her ballast water, tanker washings or bilge water and other oily water at will.
A:to discharge
B:to be discharged
C:discharging
D:being discharged

出自：海船船员证

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