Which lines in this excerpt from edgar allan poe's "the raven" show the use of flashback?

Once upon a midnight dreary, while I pondered weak & weary,

Over many a quaint & curious volume of forgotten lore,

While I nodded, nearly napping suddenly there came a tapping,

As of some one gently rapping, rapping at my chamber door,

"Tis some visitor," I muttered, "tapping at my chamber door-

Only this, and nothing more."

Ah, distinctly I remember it was in the bleak December,

And each separate dying ember wrought it's ghost upon the floor.

Eagerly I wished the morrow; -vainly I had sought to borrow

From my books surcrease of sorrow-sorrow for the lost Lenore-

For the rare and radiant maiden whom the angels name Lenore-

Nameless here for evermore.

[A] Once upon a midnight dreary, while I pondered weak & weary,

[B]Ah, distictly I remember it was in the bleak December.

what is the passage

anyone who was dealing with communism in soviet union in his time had an ideal picture of equality, freedom, the struggle of the working class for a better future, the success of the aristocracy's overthrow and the emancipation of subjugation.   however, anyone who would go to soviet union to see the functioning of the communist system, would be convinced that it was about sad people, about everyday bad life, about the brutal attitude of communist leaders, about ill obsession to completely exterminate every thought on aristocracy. thus, orwell wanted to show all the absurdity, the brutality of the system, the unbearable rule of suspicious morality, the ignorant people who try to play professionally.

the answers are: b. and e.