— Have you ever been to the Great Wall in Beijing?—__________A. Yes I am .B. No I don’

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— Have you ever been to the Great Wall in Beijing?

—__________

A. Yes, I am .

B. No, I don’t.

C. No, I’ve never been there.

D. Certainly, I went there.

热搜:medline数据库中to字段是表示非英文文献的原文题名