_____ you can not answer this question,we have to ask someone else for help.A.Although B.WhileC.Whether D.Since

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_____ you can not answer this question,we have to ask someone else for help.A.Although B.While
C.Whether D.Since

Since,表示既然,因为~

D.Since既然

_D____ you can not answer this question,we have to ask someone else for help.A.Although B.While C.Whether D.Since
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