5. There is a _______ which has not been charted and might cause ship groundings.
(A) shoal
(B) crane
(C) breakwater
(D) quay
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統計: A(479), B(95), C(117), D(37), E(0) #3033205
統計: A(479), B(95), C(117), D(37), E(0) #3033205