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  29
问题 If headaches only occur at night, lack of fresh air is often the cause.
选项 A、start
B、begin
C、happen
D、visit
答案C
解析
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