◎ 题干
Do you think maths ______ useful subject?
[     ]
A. is a
B. is an
C. are a
D. are an
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Do you think maths ______ useful subject? [ ]A. is a B. is an C. are a D. are an …”主要考查了你对  【不定冠词(a,an)】【系动词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。