Our class teacher ( )very happy to hear the good news.(be)理由

问题描述:

Our class teacher ( )very happy to hear the good news.(be)理由

觉得还是填 was 比较合适,看语境,这件事情已经发生了,所以是过去式.当然也是可以是猜测,老师听到这个好消息会很高兴,可以用would be