In English, (l and (] are allophones of the phoneme /l/ because they occur in () , i.e.they never appear in the same sound contexts. [] always occurs before vowels (as in theword leaf, look), while ] comes after vowels and before consonants (as in the word feecold).
A . free variationB . regional differencesC . a minimal setD . complementary distribution
出自:伊犁师范-英语语音