One and a half hour()since we arrive. No one has come to meet us.
A、have passed
B、was passed
C、pass
D、has passed
A、have passed
B、was passed
C、pass
D、has passed
A、A.one and a half hour’s B、B.one and a half hour C、C.an hour and a half’s D、D.an hour’s and a half
A、Immediately upon abandoning the vessel B、Only when there is a chance of their being seen by a rescue vessel C、At one hour intervals D、At half hour intervals
A、Only when there is a chance of their being seen by rescue vessels B、At half-hour intervals C、At one-hour intervals D、Immediately upon abandoning the vessel
A、At one hour intervals B、At half hour intervals C、Only when there is a chance of their being seen by rescue vessels D、Immediately upon abandoning the vessel
A、A.Only when there is a chance of their being seen by rescue vessels B、B.At half hour intervals C、C.At one hour intervals D、D.Immediately upon abandoning the vessel
A、one meter from the tank bottom and one meter below the tank top B、one half the ullage of the tank and one meter below the tank top C、one half the ullage of the tank and one meter above the tank bottom D、at three meter intervals from the tank top to the bottom