问题
单项选择题
Permission is kindly requested（）the ballast water.
A.pump out
B.to pump out
C.pumping out
D.be pumped out
答案
参考答案：B
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Permission is kindly requested（）the ballast water.
A.pump out
B.to pump out
C.pumping out
D.be pumped out
参考答案：B