Правильно составленное предложение из данных слов: have, doing, we, been, exercise, 3 minutes, this, for: a)we for 3 minutes have been doing this exercise. b)have been we doing this exercise doing for 3 minutes. c)we been have this exercise doing for 3 minutes. d)for 3 minutes we have doing been this exercise. e)we doing have been this exercise doing for 3 minutes. f)we for 3 minutes been have doing this exercise. g)we have been doing this exercise for 3 minutes. h)this exercise we have been for doing 3 minutes.