ln English if a word begins with a [l] or a [r],then the next sound must be a vowel. This is a(n)_ .
- A、 assimilation rule
- B、 sequential rule
- C、 deletion rule
- D、 grammar rule

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ln English if a word begins with a [l] or a [r],then the next sound must be a vowel. This is a(n)_ .

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