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

作者: tihaiku 人气: - 评论: 0
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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解析 preventing。解析:考查非谓语动词。在because引导的从句中已有谓语动词,这里要用非谓语动词形式。该动词表示的动作与前面的主语it构成逻辑上的主谓关系,故用其现在分词形式preventing。

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