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【题目】They are doing their homework.(对划线部分提问)

【答案】What are they doing?
【解析】划线部分是doing theirhomework做一件事,用what提问(大写),其余部分变为一般疑问句即可,陈述句改为一般疑问句时,如果谓语是实意动词要借助动词放在主语前面,然后实意动词变原形,其余照写,而句子的时态是一般过去时,所以借的助动词是did。还有一点要注意的是:如果划线部分包含实意动词,要把实意动词用do来代替,即改为are they doing.

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