单项选择题
It was demanded that the injured crewmembers（）at once.
A.was treated B.would be treated C.being treated D.be treated
单项选择题 It is NOT advisable to use nylon for alongside towing because it（）.
单项选择题 It is good practice to use long towlines for ocean tows because the（）.
单项选择题 In the International Code of Signals，the code signal meaning I require immediate assistance is（）.
