16. Whentwo power-driven vessel are meeting_____   so as to involve risk of collision, each shall alter her course to starboard so that each shall pass on the port side of the other.
(A). on reciprocal
(B). in reciprocal
(C). on reciprocally
(D). in reciprocally

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統計： A(5), B(5), C(1), D(0), E(0) #1255007