【題目】We need air to keep us ．
A.live
B.alive
C.living

【答案】B
【解析】句意：我們需要空氣維持生存。A.居住；B. 活著的；C. 生活/生存。keep sth+adj，意思是：使---保持某種狀態(tài)，所以答案是：B。

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