複選題
3. In cases where more than 25 percent of ship’s personnel has been changed, for the sake
of safety, you had better conduct the drills within _____.
(A) 24 hours
(B) seven days
(C) one month
(D) three months
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統計: A(197), B(208), C(31), D(11), E(3) #2652687
統計: A(197), B(208), C(31), D(11), E(3) #2652687