final petitors is limited though people have signed up for the short list.
A. The number of; a number of
B. The number of; the number of
C. A number of; a number of
D. A number of; the number of
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(答案→)A. The number of; a number of
B. The number of; the number of
C. A number of; a number of
D. A number of; the number of
解析：The number of+名词的复数“……的数量”； a number of+名词的复数“许多……。句意：最后参赛的人数有限，尽管有许多人已经填表报名。根据句意故选A。