根据下面资料,回答题 Almost everyone suffers from a headache 21 (occasional). But som...

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问题 根据下面资料,回答题
Almost everyone suffers from a headache 21 (occasional). But some people suffer from repeated, frequent headaches.
What is headache  What causes it  What can you do about a headache  What research is being done on headaches  The dictionary de

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答案

解析occasionally。解析:考查副词。此处修饰动词suffers,应用副词形式occasionally。
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