问题标题:
weneedtohavesomepractice()ourtheory.A.onwhichtobaseB.tobaseC.tobaseD.onthattobase为什么选A!
问题描述:

weneedtohavesomepractice()ourtheory.A.onwhichtobaseB.tobaseC.tobase

D.onthattobase为什么选A!

彭平回答:
  A   baseon固定搭配,在这里是介词前置了.
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