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38. Donkeys and camels are still widely used in some parts of the world _____ of burden.

38. Donkeys and camels are still widely used in some parts of the world _____ of burden.

A.for animals                B. as animals                C. as beasts                   D. instead of beats

Donkeys and camels are still widely used in some parts of the world _____ of burden.

　 A. for animals　 B. as animals　 C. as beasts　 D. instead of beats