(2013·濟南一模)________ you are unable to deal with it, perhaps we should ask someone else for help.
A．Although B．While
C．Since D．Unless
C
選C　考查狀語從句。句意：既然你不能處理此事，我們也許應(yīng)該請別人來幫忙。since“既然，由于”，符合句意。although“盡管”；while“當(dāng)……時”；unless“除非”。
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