He comes back to his hometown to see his parents at regular _________.

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问题 He comes back to his hometown to see his parents at regular _________.

选项 A、gaps
B、pauses
C、intervals
D、spans

答案C

解析 “At regular intervals=often”是固定搭配。例如:The phone rang at regular intervals all afternoon。所以,正确答案为C。
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