Among the petitors, there are three little girls, is Mary.
A. the smallest of whom
B. the smaller of whom
C. the smallest of them
D. the smallest one
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(答案→)A. the smallest of whom
B. the smaller of whom
C. the smallest of them
D. the smallest one
解析：考查定语从句和形容词。根据句子的three说明应该使用最高级的形式，whom指代three little girls在句中作为of的宾语。句意：在这些竞争对手中，有三个小女孩，其中最小的是Mary。故A正确。