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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