Anonymous There are only one type of eyeglasses in this store for sale Incorrect. Anonymous There is only one type of eyeglasses in this store for sal e. Correct.
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AnonymousThere are only one type of eyeglasses in this store for saleIncorrect.
AnonymousThere is only one type of eyeglasses in this store for sale.Correct.
AnonymouseyeglassesThis is excessively formal. It's much more common just to say or write glasses.
AnonymousCan you ever use are with one type of?No. At least not when "One type of ..." is the subject you're making the agreement with.