问题补充：
He must be from America, can be judged from his accent.
A. that
B. which
C. it
D. where
答案：
A. that
(答案→)B. which
C. it
D. where
解析：考查定语从句。本题which引导非限定性定语从句，指代前面一件事，选B。
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