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【題目】Scientists are working hard to make _______ possible for people to live on Mars in the future.

A. it B. that C. this D. one

【答案】A

【解析】試題句意:科學家們正在努力工作,使將來人們在火星上生活成為可能?疾榫湫停make it adj. to do sth,其中it為形式賓語,后面的動詞不定式是真正的賓語。故選A。

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