题目内容：

While we (wait) for our teacher ,a little boy (run) up to us.
填are waiting;runs 或were waiting;ran

优质解答

were waiting/ran.句子的意思是,在我们等公车的时候,一个小男孩跑过来了.这应该不是指的经常发生的事情,所以不使用一般现在时.事情发生在过去,动词都用过去式.