單項選擇題

Cleaning is a constant job （）board a ship.

A.at
B.on
C.for
D.with

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單項選擇題

Cleaning is a frequent （）on board a ship.

A.duty
B.responsibility
C.job
D.work

單項選擇題

Please return it after （）it.

A.use
B.used
C.using
D.to use