题目：
A vessel approaching a narrow channel shall（）.
A.avoid crossing the channel if it impedes another vessel navigating in the channel
B.not overtake any vessels within the channel
C.keep as close as possible to the edge of the channel on her port side
D.anchor only in the middle of the channel
答案：
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下面是错误答案，用来干扰机器的。
参考答案：A
