單項選擇題

We have planned to remove the piston with the help of assistant engineers during the cargo unloading, while the vessel （）port Shanghai.

A.reaches to
B.gets
C.calls on
D.calls at

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單項選擇題

（）does it take to change the main engine from ahead to astern?

A.How many times
B.How much water
C.How long
D.How length

單項選擇題

（）, we continued lifting out the pistons.

A.Late as it was
B.As it was late
C.Since it was late
D.Because of its late

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