Recordersare used ________ our students’ listening skill.


  1. A.
    to help improve
  2. B.
    to helping to improving
  3. C.
    to help improving
  4. D.
    helping to improve
A
錄音機(jī)被用作幫助提高學(xué)生的聽力技巧，為use 的被動用法be used to doing 習(xí)慣作某事
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