单项选择题
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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（）, we continued lifting out the pistons.
A.Late as it was
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The exhaust valve is opened at about the same time （） the air inlet ports are opened.
A.before
B.after
C.when
D.until
