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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
第一空考查短語：can’t…  too 再什么也不為過，第二空考查短語：at a high altitude以很高的海拔，第三空考查定語從句，先行詞為a high altitude，從句中缺少地點狀語。所以選B。
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