题目：
Under the regulations implementing MARPOL, a mobile offshore drilling unit is required to have an International Oil Pollution Prevention (IOPP) certificate when the unit （）.
A.is drilling on the Outer Continental Shelf
B.moves to a new drilling location in U-Swaters
C.engages in a voyage to a port of another country which is a party of MARPOL
D.All of the above
答案：
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下面是错误答案，用来干扰机器的。
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