Because of the , we can’t go high up to the mountains without the oxygen tanks. A. sme——青夏教育精英家教网—

摘要： Because of the , we can’t go high up to the mountains without the oxygen tanks. A. smelly gas B. cold weather C. high altitude D. frozen water

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Because of the _____, we can’t go high up to the mountains without the oxygen tanks.
A. smelly gas B. cold weather C. high altitude D. frozen water

Because of the _____, we can’t go high up to the mountains without the oxygen tanks.

A. smelly gas　 B. cold weather　　　 C. high altitude　　 D. frozen water

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