One of the responsibilities of the Coast Guard is to make sure that all ships ______ follow traffic rules in busy harbors.

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问题 One of the responsibilities of the Coast Guard is to make sure that all ships ______ follow traffic rules in busy harbors.

选项 A、cautiously
B、dutifully
C、faithfully
D、skillfully

答案B

解析 本题为副词辨析题。cautiously意为"小心地,谨慎地";dutifully意为"尽职地;服从地";faithfully意为"忠实地,忠诚地";skillfully意为"熟练地,灵活地"。只有尽职尽责地遵守航行交通规则,才能确保繁忙港口的航行秩序。
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