◎ 题干
—How long have you been like this?
— ________.

A. Yesterday before
B. Yesterday
C. Before yesterday
D. Since yesterday
◎ 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 like this? — ________. [ ]A. Yesterday before B. Yesterday C. Before yesterday D. Since yesterday …”主要考查了你对  【现在完成时】【介词】  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。