4. Lower-level management function most effectively when they have thorough training and unimpeded communication with workers, supervisors, and one another.
(A) management function most effectively when they have
(B) managers function most effectively when they have
(C) management functions most effectively when they have
(D) managers function most effectively when they have received（B）
(E) management functions most effectively when it has
为什么D不行呢？？？they have/ they have received,用完成时来表示不行吗？
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