【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】句意:科學(xué)家正在努力使未來(lái)人們住在火星上成為可能。it 可做形式賓語(yǔ),代替真正的賓語(yǔ)to live in the future。所以選A。

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