阿摩線上測驗
21. ______ programs the daily maintenance work and the boatswain instructs the ratings to perform the tasks.
(A) Second officer
(B) Third officer
(C) Chief officer
(D) Master
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統計： A(35), B(86), C(517), D(40), E(0) #2999695
統計： A(35), B(86), C(517), D(40), E(0) #2999695