问题补充：
-- did you stay in the Marco Polo Hotel?
--About one week. We enjoyed our stay there.
A. How many
B. How much
C. How often
D. How long
答案：
A. How many
B. How much
C. How often
(答案→)D. How long
解析：根据后文的答语为About one week，说明为一段时间，故选答案为D
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