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

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

admin2020-12-24  12
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if。解析：考查状语从句。此句为条件状语从句，缺少引导词，且从句中省略了主语和be动词，故填if。
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