Read the sentence. Some of the items on my shopping list _ chanterelle mushrooms, white asparagus, and eel _ were impossible to find. Which punctuation should be added in the underlined spaces?

The list “chanterelle mushrooms, white asparagus, and eel” is extra information inserted into the sentence. Dashes can set off this interruption clearly: “Some of the items on my shopping list—chanterelle mushrooms, white asparagus, and eel—were impossible to find.” The subject and verb still fit together as “Some of the items … were impossible to find.”

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