问题
单项选择题
The port clearance for a ship should be granted（）the completion of loading or discharging in the port.
A.before
B.when
C.after
D.during
答案
参考答案：C
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The port clearance for a ship should be granted（）the completion of loading or discharging in the port.
A.before
B.when
C.after
D.during
参考答案：C