A vessel which does not normally engage in towing operations is towing a vessel in distres
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A vessel，which does not normally engage in towing operations，is towing a vessel in distress.She ____.
A.need not show the lights for a vessel engaged in towing，if it is impractical to do so
B.may show the lights for a vessel not under command
C.must show a yellow light above the stern light
D.must show the lights for a vessel towing
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