单选题（）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.Awhich is assistedBthat assist youCwhen you assistedDwhen being assisting
单选题
（）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
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