Every student as well as all the teachers asked to be on the playground to have a school

问题补充：

Every student as well as all the teachers asked to be on the playground to have a school meeting at once.

A. am B. is C. are

答案：

解析：句意为：每个学生以及所有老师都要求马上到操场开校会。根据句子分析，本句的主语是every student，as well as all the teachers是介词短语表示伴随。因此，根据主谓一致原则，可知应选B。