Sales director is a position communication ability is just as important as sales skills.A.

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A. which
B. that
C. when
(答案→)D. where
解析：考查定语从句。句意：“销售经理是一个职位，在这个职位上，交流能力和销售能力一样重要。”先行词position定语从句中缺少的是地点状语，position在从句中充当的成分应是“on this position”，故选择where。选D。