Which of the following sentences contains a parenthetical phrase? (poll 8581143)

Which of the following sentences contains a parenthetical phrase?

I went to the store before I had seen that we already had milk.

I went to the store, knowing that we already had milk.

I went to the store and bought milk.

I went to the store, but I didn't buy any milk.

I went to the store and now I wish I had bought milk.

I went to the store so that I could buy us some milk.

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