2. 外语
  3. if headaches only occur at night, lack of fresh air is often the cause.

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

admin2009-06-15  16
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
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