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【题目】What _______ headaches ?

A. causeB. is causeC. causesD. are cause

【答案】C

【解析】

句意:什么引起的头疼?根据cause造成,引起,动词,前面不能用be的形式,排除B/D;主语What看作是单数,谓语动词用单数形式;故选C

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