◎ 题干
—How long have you been there?    —_______.
[     ]
A. Once
B. For two years
C. Since two years
D. Twice a year
◎ 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“—How long have you been there?—_______.[ ]A. Once B. For two years C. Since two years D. Twice a year …”主要考查了你对  【介词】【特殊疑问句】  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。