题目：
-----Did you have a hard time traveling back home?
-----Yes, it ______ for four days when I arrived in Guiyang and all the roads______ covered with ice.
A．snowed, were
B．was snowing, had been
C．had been snowing, had been
D．had snowed, were
答案：
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下面是错误答案，用来干扰机器的。
3000m
