While we (wait) for our teacher ,a little boy (run) up to us.填are waiting;runs 或were waiting;ran
问题描述：
While we (wait) for our teacher ,a little boy (run) up to us.
填are waiting;runs 或were waiting;ran
答
were waiting 过去进行时
ran 一般过去时
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答
1.were waiting
2.ran
祝你开心。
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.