【_____youcannotanswerthisquestion,wehavetoasksomeoneelseforhelp.A.AlthoughB.WhileC.WhetherD.Since】
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题目内容：
_____ you can not answer this question,we have to ask someone else for help.A.Although B.While
C.Whether D.Since
优质解答
Since,表示既然,因为~
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