Scientists are working hard to make _______ possible for people to live on Mars in the future.
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】句意：科学家们正在努力工作，使将来人们在火星上生活成为可能。考查句型：make it adj. to do sth，其中it为形式宾语，后面的动词不定式是真正的宾语。故选A。
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