單項選擇題The third officer（）at the telegraph and also writing on the log.
A.work
B.is working
C.are working
D.was working
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1.單項選擇題There we shall call at some ports（）and discharge some cargo.
A.to loading
B.be loading
C.loading
D.to load
2.單項選擇題We shall（）some ports in Canada.
A.call at
B.call on
C.call in
D.call up
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