阿摩線上測驗
35. The distressed fishing vessel used its radio to send an emergency ________ to the coast guard, requesting immediate assistance.
(A) situation
(B) single
(C) signal
(D) signature
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統計： A(0), B(0), C(1), D(0), E(0) #3930868
統計： A(0), B(0), C(1), D(0), E(0) #3930868
