单项选择题
A.Has B.Had C.Have D.Having
Go （）this ladder and walk aft.A.downB.toC.upD.in
单项选择题Go （）this ladder and walk aft.
A.down B.to C.up D.in
The first cabin astern of the saloon is（）.A.heB.himC.hi...
单项选择题The first cabin astern of the saloon is（）.
A.he B.him C.his D.they
Secure danger area and （）, please.A.reportingB.reportC....
单项选择题Secure danger area and （）, please.
A.reporting B.report C.reports D.reported
