题目内容

We ________ in the river when it began to rain.


  1. A.
    swim
  2. B.
    have swum
  3. C.
    were swimming
  4. D.
    are swimming
C
表示“过去某一动作发生的时候,另一动作正在进行”常用“过去进行时+when+一般过去时”。
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