One of the responsibilities of the Coast Guard is to make sure that all ships______follow traffic rules in busy harbors.
A、
cautiously
B、
dutifully
C、
faithfully
D、
skillfully
【正确答案】
B
【答案解析】
dutifully表示“守本分地”。A项cautiously表示“小心谨慎地”；C项faithfully表示“忠诚地”；D项skillfully表示“熟练地”。
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