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You can’t be ______ when you camp _____ a high altitude, ________ the air is thin.
A.enough careful; at; whichB.too careful; at; where
C.careful enough; on;at whichD.too careful; on; that
B
第一空考查短语:can’t…  too 再什么也不为过,第二空考查短语:at a high altitude以很高的海拔,第三空考查定语从句,先行词为a high altitude,从句中缺少地点状语。所以选B。
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