题目内容
12．Mary said she had never seen ___________ UFO before．（ ）| A． | an | B． | a | C． | the | D． | / |
分析 玛丽说她以前从来没有见过UFO．
解答 正确答案：B．根据句意此处泛指UFO，且UFO第一个字母U发辅音音素/ju：/，应填写不定冠词a，故选择B．
点评 本题考查冠词，基础题，掌握冠词的基本用法，根据题干即可作出选择．
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