37.Which of the following answers is the correct meaning of the sentence「Pilotage is compulsory when entering this port」?
(A)When entering the port, the vessel must not take a pilot.
(B)When entering the port, the vessel may take a pilot when necessary.
(C)When entering the port, the vessel can occasionally take a pilot.
(D)When entering the port, the vessel must take a pilot.

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統計： A(0), B(2), C(2), D(9), E(0) #2401193