It is mobile phone he sent me. I’ve never seen better one before.A. a; aB. the; aC. a; t

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A. a; a
(答案→)B. the; a
C. a; the
D. the; the
解析：根据mobile phone 后定语从句he sent me可知此处为特指，故用定冠词；下文更好的一个，one是泛指任何一个，为泛指，故用不定冠词。选B。