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题目

Before you join a ship, make sure you have all the ______ certificates need to the functions you will be performing on board.A. expiredB. overdueC. InvalidD. valid

Before you join a ship, make sure you have all the ______ certificates need to the functions you will be performing on board.

A. expired

B. overdue

C. Invalid

D. valid

题目解答

答案

D. valid

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