15. Everyone in this country should work hard and do what they can    against national smog.

A. fight      B. fought

C. fighting    D. to fight

15.   D考查非謂語動詞。句意：這個國家的每一個人都應該努力去盡他們自己所能去抵抗全,性的霧霾。分析句子結構可知what they can是作動詞do的賓語，can后省略了實義動詞do,后面是不定式作目的狀語。故選D。

題目來源：2015全品語法快練高中英語新課標 > 訓練18 非謂語動詞和獨立主格

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