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When you're learning English, use it, ________ you'll lose it．


  1. A.
    but
  2. B.
    or
  3. C.
    then
  4. D.
    and
B
根據(jù)句意“你學英語時就使用它，否則你就會丟掉它”，but雖然表示轉折，但它是“但是”的意思，不符合題意，所以只能選B。
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