Listen a small number of students in the classroom.A. talk B. are talking C. is talking

问题补充：

Listen, a small number of students in the classroom.

A. talk B. are talking C. is talking

答案：

解析：listen是引起你的注意要用现在进行时，结构为be+现在分词，主语是少部分的

学生，是复数，故选B。