题目内容

Don’t be afraid of asking for help ___________ it is needed.
A．unlessB．sinceC．whenD．although
C

试题分析：A. unless除非，如果不，B. since既然，自从，C. when当…时候，D. although虽然，句意：当有需要的时候，不要害怕求助。所以选C。
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