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【题目】They have to fight pollution to protect the environment. (对划线部分提问)
do they have to to protect the environment?

【答案】What;do
【解析】句意:他们不得不治理污染来保护环境。原句划线部分fight pollution表示行动,用疑问代词what(什么),然后把原句剩余部分改为一般疑问句,原句含有实意动词have to,改为疑问句用助动词do,所以答案为What;do。

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