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 dutifully“守本分地”。cautiously“小心谨慎地”;faithfully“忠诚地”;skillfully“熟练地”。要填副词修饰follow,表示老实地遵守交通规则,故选B。
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