单项选择题
A.a dredge and widen
B.dredged and widened
C.dredging and widening
D.being dredging and widening
单项选择题 In a crossing situation on international waters, a short blast by the give-way vessel indicates that the vessel（）.
单项选择题 In a crossing situation on open waters, a sailing vessel shall keep out of the way of all the following vessels except a vessel（）.
单项选择题 In a crossing situation,the vessel which has the other on her own starboard side shall（）.