单项选择题
A.is
B.be
C.will be
D.to be
单项选择题 One of the requirements for a general average act is（）.
单项选择题 No jettison of cargo shall be made fair as（）unless such cargo is carried in accordance with the recognized custom of the trade.
单项选择题 No jettison of cargo shall be made fair as（）unless such cargo is carried in accordance withthe recognized custom of the trade.