Which alternative is not using the same verb tense as the others?

✂️ a) Lily failed the final test because she had not been attending class.

✂️ b) They had been talking for over an hour before Marshall arrived.

✂️ c) Joe wanted to sit down because he had been standing all day at work.

✂️ d) How long had you been studying Portuguese before you moved to Brazil?

✂️ e) She had never seen a bear in her life before moving to Alaska.

Responda: Which alternative is not using the same verb tense as the others?