The answer is A!
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Metaphors are used to represent the appearence of the snake. They create the meaning of a rough skinned, black and ribbed snake. The snake is similar to the appearence of a rounded tire. This gives the reader an imagination of what the snake looks like. Similes are also used in this poem to give a clear picture of the position of the snake. It appears the black snake looks very light and limp.
Was is a linking verb that is the past tense form of the linking verb is which refers to an event that already happened. If and as if can be related to something that has happen. Suppose has a similar definition with the two verbs. Hence the answer is D. all of the above
Here are two examples of repetition in Romeo and Juliet:
1. Juliet: "O Romeo, Romeo! wherefore art thou Romeo?" (II.II.33)
2. nurse: “O woeful, O woeful, woeful, woeful day!” (76, 30)