The RiverNile ________ flood large areas, but now its water ________ produceelectricity.


  1. A.
    used to; is used to
  2. B.
    was used to; is used to
  3. C.
    used to; uses to
  4. D.
    was used to; is using to
A
used to do 意為過去常常做某事be used to do 為use的被動用法
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