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The structure "verb in -TA form + TOKORO GA" means "although, but, however". It is placed between two clauses to emphasize the opposition between what was expected, and what eventually happened. The result can be good or bad. Notice that the -TA form is often understood as the past form for verbs. But in this structure, the verb must always take the -TA form, not necessarily conveying any meaning of the past tense.
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