单项选择题
（）the ship leaves at 1000 today，she can arrive there tomorrow.
A.When B.How C.If D.Should
单项选择题 （）the packing is the same，the lots are different in marks.
单项选择题 （）the morning from 0800 to 1200 Chief Officer is on duty.
单项选择题 （）should you do first when heaving up the anchor.
