Don't be afraid of asking for information ________ it is needed.


  1. A.
    when
  2. B.
    after
  3. C.
    although
  4. D.
    unless
A
解析：
when當……的時候；
after在……之后；
although雖然；
unless除非……。根據(jù)題意選A“在需要的時候不要害怕問問題”。
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