◎ 题干
I got an e-mail this morning. It's _____ my best friend John.

[     ]

A. in
B. on
C. at
D. from
◎ 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“I got an e-mail this morning. It's _____ my best friend John. [ ]A. in B. on C. at D. from …”主要考查了你对  【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。