Nobody but Mary and I _was__ in the classroom at that time.为什么填was?
问题描述：
Nobody but Mary and I _was__ in the classroom at that time.为什么填was?
答
nobody是主语,所以用单数,at that time是曾经的意思,所以用过去式,所以用was
but mary and I只是补充成分,无所谓.