单项选择题
The unlashing work must be finished before （）.
A.discharged B.being discharged C.discharging D.discharges
单项选择题 We haven’t got enough （）to do the work.
单项选择题 Stow the derricks （）before sailing.
单项选择题 We secure and tighten the lashing bars for the containers with （）.
