title: 请教：Iwashalfwaybacktothecottagewh? 
desc: 请教：I was halfway back to the cottage where my  mother liv_____Susan  caught  up  with  me.
  A.when   
  B.while
  C.until
  D.though
  正确答案是A。为什么？请详解
answer: when指"这个时候"的意思.
  我的回我母亲居住的小屋的半路上,这时候susan赶上了我.