9. Mary: “I was swimming.” Jill: “Mary said (that) she ___ swimming.” a. has been b. had been c. have been

Перевод задания: Мэри: «Я плавала». Джилл: «Мэри сказала, что она плавала».

Past Continuous в косвенной речи изменяется на Past Perfect Continuous: was swimming → had been swimming.

Mary said that she had been swimming. (Мэри сказала, что плавала.)

Ответ: b. had been