769.Groups of words that are not usually adjectives but function together as an adjective before a noun are hyphenated ( )

　Groups of words are hyphenated if they are not usually adjectives but serve as an adjective together before a noun.

　Groups of words are not usually adjectives. But these groups of words function together as a noun before an adjective are hyphenated.

　Groups of words are not usually adjectives but function together as an adjective before a noun. These groups of words are hyphenated.

正确答案：A

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