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【题目】All the people had to wear face masks when they went out. (改为一般疑问句)

_______ all the people _______ to wear face masks when they went out?

【答案】Did have

【解析】

句意:所有的人出去时都得戴口罩。

根据句意理解及原文动词had可知,原句用的是一般过去时,所以这里变成一般疑问句需要加助动词did,且疑问句直接把助动词did提前即可,而加了助动词,原来的动词要变成原形,故答案为Didhave

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