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填空题 49. Volunteers are also needed in hospitals ______ children while their parents see a doctor.

解析

【答案】to watch over
【解析】根据题干关键词 “in hospital, children, their parents see a doctor” 定位到的第三段第三句 “Hospitals need volunteers to watch over children while their parents see a doctor.” 可知,当孩子的父母在医院看病时,志愿者们还会帮忙照看孩子。结合句子结构,由于前句中出现了are needed,后接to do 的形式。故本题答案为to watch over。

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