15.As vessels sail close to the coast, mariners can use peculiar targets in land as a landmark to
________.
(A) navigate
(B) negotiation
(C) neglect
(D) newsstand
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統計: A(543), B(121), C(54), D(72), E(0) #2308959
統計: A(543), B(121), C(54), D(72), E(0) #2308959