You'd better take some medicine with you ________ someone gets sick．


  1. A.
    so that
  2. B.
    as soon as
  3. C.
    as long as
  4. D.
    in case
D
解析：
句意為“你最好隨身帶一些藥，以防有人生病．”in case以防，以免．
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