Our class of thirty-two boys and twenty-three girls.
A. poses
B. concludes
C. consists
D. contains
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A. poses
B. concludes
C. consists
D. contains
解析：考查动词搭配：句意：我们班由2个男生和23个女生组成。由…组成“consist of”， A. poses作曲，组成（be posed of）B. concludes 总结，D. contains包含，不和of搭配，选C。