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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解析 is。解析:考查主谓一致。此处的be动词作谓语,根据主谓一致原则,当从句作主语时,谓语动词一般用单数,故填is。

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