Students or teachers can participate in excursions (短途旅行) to lovely beaches around the island at regular ________. ( 章节：6 难度：3)_做题室

单项选择题Students or teachers can participate in excursions (短途旅行) to lovely beaches around the island at regular ________. ( 章节：6 难度：3): A、gaps; B、rate; C、intervals; D、length

正确答案：C
答案解析：
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