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Everyone in this country should work hard and do what they can _____ against national smog.
A．fight B．foughtC．fightingD．to fight
D

試題分析：句意：這個國家的每個人都應(yīng)該努力工作盡最大的能力來對抗全國范圍的大霧。這里do后面是賓語從句what they can，慘后面省略了do，后面是不定式做目的狀語，所以選D。
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