问题
选择题
— have you stayed in Shanghai?
— For about seven days.
A. How soon B. How long C. How often
答案
答案：B
根据答语For about seven days.大约七天了，可推断出上句问的是“你在上海呆了多长时间了？所以选B，How soon 多久，How often 表示频率，多久一次。
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