In the sentence
I pretended that I understood, lest he think I am stupid or deaf.
the "he think" part is definitely present subjunctive, but I'm not sure how the "I am" part should be conjugated. I'm thinking it might also be present subjunctive:
I pretended that I understood, lest he think I be stupid or deaf.
or past subjunctive:
I pretended that I understood, lest he think I were stupid or deaf.
All three sound all right to me. Is there one correct conjugation to use in this case?