If headaches only occur at night, lack of fresh air is often the cause.

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问题 If headaches only occur at night, lack of fresh air is often the cause.

选项 A、deliver
B、fall
C、happen
D、arrive

答案C

解析 句意为:如果头疼只是在晚上发生,缺少新鲜的空气是原因。occur“发生”,四个选项:deliver“递送,交付”;fall“跌倒,降低”;happen“发生”;arrive“到达”。
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