问题补充：
— will you stay in America?
— About two months.
A. How many
B. How often
C. How long
D. How
答案：
A. How many
B. How often
(答案→)C. How long
D. How
解析：How many多少，与可数名词连用；How often 多久一次，How long多长时间，How如何；句意：你在美国将呆多久？大约两个月。故选C.
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