Susie __________ (have/had/having) a bird house.One day a beautiful red bird ___________ (come/came/coming).It _________ (made /make/making) a little bed in the house .Then it __________ (spent/spend/spending) a lot of time in the house.Susie____ (we

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Susie __________ (have/had/having) a bird house.One day a beautiful red bird ___________ (come/came/coming).It _________ (made /make/making) a little bed in the house .Then it __________ (spent/spend/spending) a lot of time in the house.Susie____ (went/go/going) near to the house and _____ (seeing/see/saw) three baby birds .Soon they_________(become/becoming/became) big birds and __________ (fly/flew/flying) away.

had; came;made;spent;went;saw;became;flew
过去式

全部填过去式,很简单。

全是过去式,应该是考察动词过去式的。