20．Lily's mother is            teacher in a school．（　�。�
A．aB．anC．theD．/

分析 麗麗的媽媽是一所學校的老師．

解答 答案A
一名教師，表示泛指，排除C，D，根據(jù)a與an的區(qū)別，a用在輔音音素前，an用在元音音素前，teacher的發(fā)音為[?ti：t??（r）]，輔音音素開頭，排除B，故選A

點評 找出考點，根據(jù)a與an的區(qū)別，利用排除法，推出答案

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