--do you clean the reading room?-Every two or three days.A. How longB. How farC. How so

发布时间：2020-08-17 12:06:46

--    do you clean the reading room?
---Every two or three days.
A. How long
B. How far
C. How soon
D. How often

网友回答

A. How long
B. How far
C. How soon
(答案→)D. How often
解析：从答句中得知，问句应为“多少时候一次”。
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