A-A+ If headaches only occur at night lack of fres 2022-08-05 14:30:00 问答库 阅读 168 次 问题详情 If headaches only occur at night, lack of fresh air is, often the cause.A．startB．beginC．happenD．visit 请帮忙给出正确答案和分析，谢谢！ 参考答案 正确答案：C
