Only D expresses correctly what you wish to express. Meowmechon I suppose a past perfect tense can't stand alone but using present perfect also means a continuation into present time (violates the requirement), You suppose correctly.
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Meowmechon I suppose a past perfect tense can't stand alone but using present perfect also means a continuation into present time (violates the requirement),You suppose correctly.
Meowmechon I already set up another past tense in the clause,But it occurred at the same time. Past perfect is properly used only to represent the earlier of two past actions when their order of occurrence is otherwise unclear.