If cloned animals could be used as organ donors, （).A、people don’t have to worry about c

If cloned animals could be used as organ donors, ().

A、people don’t have to worry about cloning twins for transplants

B、raising animals such as pigs can help solve the problem

C、the human body attacks and destroys tissue from other species

D、it may be more efficient to produce such animals by cloning than by cur

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