组卷网 > 初中英语综合库 > 语法 > 冠词 > 不定冠词 > a/an的区别
题型:单项选择 难度:0.85 引用次数:30 题号:19095431
The teacher wants his students to conduct ________ survey for the food.
A.aB.anC.theD./

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