单项选择题When a ship arrives at a foreign port ,for the safety of the ship ,the ship usually needs a pilot to take her into and out of the harbour ,or through the canal.()
A.当船舶到达外国港口时,为了船舶安全,船舶通常需要引航员把船引进和引出港口或运河。
B.当船舶到达外国港口时,船舶通常为了引航员安全需要把船引进和引出港口或运河。
C.当船舶到达港口时,船舶通常为了引航员安全需要把船引进港口或运河。
D.当船舶到达外国港口时,船舶通常为了引航员安全需要把船引进运河。