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(尽职地);cautiously(谨慎地);faithfully(忠实地);skillfully(灵活地,巧妙地)。
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