题目内容
In English, if a word begins with [l]or[r], then the next must be a vowel. This is a(n)_____
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If two sounds in a language make a contrast between two different words, such as [t] in tie and [d] in die, they are said to be different___.
In English, /ph/ and /p/ occur in different phonetic environments, they are the_________of the same phoneme /p/.
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