You're ________ your time trying to persuade him；he'll never join us．


  1. A.
    spending
  2. B.
    wasting
  3. C.
    losing
  4. D.
    missing
B
該題應從trying著手考慮，其搭配應從A和B項中產(chǎn)生，spend time doing sth．是花費時間做某事，waste time doing sth．是浪費時間做某事，再由he'll never join us可知waster time doing sth．最佳。
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