单项选择题
A.on B.at C.in D.to
Sailors should do mooring work when （） harbour.A.enter...
单项选择题Sailors should do mooring work when （） harbour.
A.entering B.enter C.toenter D.entered
Shall I put the spring on this （）?A.bitB.bittC.bitingD....
单项选择题Shall I put the spring on this （）?
A.bit B.bitt C.biting D.bite
The sailors （）are making preparations for mooring.A. on...
单项选择题The sailors （）are making preparations for mooring.
A. on the bridge B. at the stern C. in the cabin D. in the engine room
