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单选题
2769. Groups of words that are not usually adjectives but function together as an adjective before a noun are hyphenated
A
Groups of words are hyphenated if they are not usually adjectives but serve as an adjective together before a noun.
B
Groups of words are not usually adjectives. But these groups of words function together as a noun before an adjective are hyphenated.
C
Groups of words are not usually adjectives but function together as an adjective before a noun. These groups of words are hyphenated.
答案解析
正确答案：A
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