问题补充：
Mary is one of the girls who always on time.
A. is
B. am
C. are
D. was
答案：
A. is
B. am
(答案→)C. are
D. was
解析：考查定语从句。one of + 复数名词，作先行词时，定语从句的谓语动词应用复数。句意：玛丽是那些总是按时的女孩中的一个。所以选C。
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