题目内容
3．He did ______ unusual thing yesterday．（ ）| A． | a | B． | an | C． | the | D． | / |
分析 他昨天做了一件不寻常的事情．
解答 答案：B
根据题干中"unusual thing 不寻常的事情"，可知 unusual的发音以元音音素开头，此处表示泛指一件事，没有特定具体指哪件事，要用冠词an，故选B
点评 熟悉冠词的基本用法，正确理解题意，给出答案．
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