40. What kind of questions should a marketing specialists think deeply whenever they need to conduct a marketing planning？
(A)when？ where？ why？
(B)when？ what？ where？
(C)why？ where？ how？
(D)what？ why？ how？.

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統計： A(4), B(4), C(5), D(13), E(0) #2728184