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

问题补充：

Don’t be afraid of asking for help it is needed.

A. unless

B. since

C. when

D. although

答案：

A. unless

B. since

(答案→)C. when

D. although

解析：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。