问题
单项选择题
As these features are not all charted, special caution should be exercised（）vessels navigating in the vicinity.
A.by
B.with
C.on
D.in
答案
参考答案：A
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As these features are not all charted, special caution should be exercised（）vessels navigating in the vicinity.
A.by
B.with
C.on
D.in
参考答案：A