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Dr.Bethunebegantoworkthehearrivedatthefront.A.momentB.placeC.wayD.reason为什么是选A.这整句话怎么理解!

题目详情
Dr.Bethune began to work the _____ he arrived at the front.
  A.moment   B.place    C.way    D.reason 为什么是选A.这整句话怎么理解!
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答案和解析
Dr. Bethune began to work( the moment )he arrived at the front. 他一到前面就开始工作 the moment 词组