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【题目】The brave doctors and nurses volunteer to go to the front line whenever they ______ (need).

【答案】are needed

【解析】

句意:这些勇敢的医生和护士在需要的时候自愿奔赴前线。

need需要,是一个动词。根据句意可知,whenever引导的从句中,主语they和动词need构成被动关系,应用被动语态。这句话使用的是一般现在时,故答案为are needed

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