问题标题:
Thechildren___leaveschool__fiveschoolA.I,tillB.don't,untilC.didn't,untilD.not,until
问题描述:

Thechildren___leaveschool__fiveschoolA.I,tillB.don't,untilC.didn't,untilD.not,until

马绍力回答:
  C.didn't,until
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