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 removes。解析:考查时态。该句是由if引导的真实条件句,表示的假设是有可能发生的,主句多用将来时或may/might/can+动词原形,if从句用一般现在时,故填removes。

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