Rule reminder
Sequence of tenses with past main clause (passato prossimo, imperfetto, passato remoto, or conditional): (1) Subordinate action SIMULTANEOUS with past main action → imperfect subjunctive (congiuntivo imperfetto). (2) Subordinate action PRIOR to past main action → past perfect subjunctive (congiuntivo trapassato: imperfect subjunctive of avere/essere + past participle).
The lawyer doubted that his client had told the whole truth. Choose the correct form: 'L'avvocato dubitava che il suo cliente _____ tutta la verità.'