Every vessel shall（）maintain a proper look-out by sight and hearing as well as by all available means appropriate in prevailing circumstances and conditions so as to make a full appraisal of the situation and of the risk of collision.<br>A:in fog<br>B:at night<br>C:in narrow fairway<br>D:at all times

Every vessel shall（）maintain a proper look-out by sight and hearing as well as by all available means appropriate in prevailing circumstances and conditions so as to make a full appraisal of the situation and of the risk of collision.
A:in fog
B:at night
C:in narrow fairway
D:at all times

出自：海船船员证

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