Lucy is the of the twins, and she is the girl in her class.A. younger; youngerB. youngest;

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A. younger; younger
B. youngest; youngest
(答案→)C. younger; youngest
D. youngest; younger
解析：英语中在两个中进行比较用比较级，在三个及以上进行比较用最高级。跟据前文在双胞胎中，可知前文用比较级。下文在班内进行比较用最高级。故选C。