2. 职称考试
  3. If headaches only occur at night,lack of fresh air is often the cause.A:start B

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

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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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