2.Tom sat(过去） under a tree and seeing his friend,---stood（B.过去）--up in no time.a.to stand b
2.Tom sat(过去） under a tree and seeing his friend,---stood（B.过去）--up in no time.
a.to stand b.standing c.stood d.would stand
两个过去式怎么看的,我觉得是standing