答：这是一道以讹传讹的题，很多编（抄）题者都不知道题目本身有问题！原题应该是：Was it the new school master who walked by?A.It must be thatB.It must have beenC.He must be D.This must have been析：这是一个强调句的一般疑问句。肯定句是：It was the new school