______ we are not asked to fill the readers' feedback, we have no need to do it.
【正确答案】 D
【答案解析】考查原因状语从句引导词。now that意为“既然”时，引导原因状语从句，D为正确答案。so that通常引导目的状语从句；B、C不用于引导从句，可排除。