（）by an ice-breaker, it is important to maintain a continuous listening watch on the appropriate VHF channel and to maintain a proper look-out for sound and visual signals.<br>A:which is assisted<br>B:that assist you<br>C:when you assisted<br>D:when being assisting

（）by an ice-breaker, it is important to maintain a continuous listening watch on the appropriate VHF channel and to maintain a proper look-out for sound and visual signals.
A:which is assisted
B:that assist you
C:when you assisted
D:when being assisting

出自：海船船员证

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