Don’t be afraid of asking for help ___________ it is needed.
A．unlessB．sinceC．whenD．a(chǎn)lthough
C

試題分析：A. unless除非，如果不，B. since既然，自從，C. when當(dāng)…時候，D. although雖然，句意：當(dāng)有需要的時候，不要害怕求助。所以選C。
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