Sales director is a position communication ability is just as important as salesA. which

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A. which
B. that
C. when
(答案→)D. where
解析：考察定语从句。在本题中 “position”为先行词，后面是其定语从句，关系词在从句中作的是地点状语，因此，应该使用关系副词“where”来引导定语从句。因此，正确答案为D选项。