The techniques now available to livestock breeders will continue

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The techniques now available to livestock breeders will continue to be（i）_____, but will probably be（ii）_____ by new ones under development.

A、fruitful.. reversed
B、refined.. upgraded
C、inconvenient.. reassessed
D、used.. supplemented
E、harmless.. improved

答案：D

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Sentence Equivalence

老师我选了a 为什么第二个空不是被new one 取代？

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