Don't be afraid of asking for help_____it's needed.A.unless B.since C.although D.when为什么不选B

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Don''tbeafraidofaskingforhelp_____it''sneeded.A.unlessB.sinceC.althoughD.when为什么不选BDon''tbeafraidofaski

Don't be afraid of asking for help_____it's needed.A.unless B.since C.although D.when为什么不选B
Don't be afraid of asking for help_____it's needed.
A.unless B.since C.although D.when
为什么不选B

Don't be afraid of asking for help_____it's needed.A.unless B.since C.although D.when为什么不选B
since怎么翻译?
when是当.的时候.