55 When a vessel is in any doubt as to whether such a head-on situation exists, she shall assume that it _____ and act accordingly.
(A)does exist
(B)doesn’t exist
(C)exist
(D)existed

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統計： A(18), B(11), C(7), D(5), E(0) #3221113

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題目解析 這道題目來自於海上航行規則的...
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