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

题型：句型转换题类：常考题难易度：普通

外研（新标准）版2017-2018学年九年级英语上册Module 12 Unit 1课时练习

They have to fight pollution to protect the environment. (对划线部分提问)

do they have to to protect the environment?

举一反三

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