【題目】They have to fight pollution to protect the environment. (對劃線部分提問)
do they have to to protect the environment?

【答案】What;do
【解析】句意:他們不得不治理污染來保護(hù)環(huán)境。原句劃線部分fight pollution表示行動,用疑問代詞what(什么),然后把原句剩余部分改為一般疑問句,原句含有實(shí)意動詞have to,改為疑問句用助動詞do,所以答案為What;do。

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