They __flowers when I got there.Awatered Bwere wateringcare wateringA.watered B.were watering C.are watering Why?

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They __flowers when I got there.Awatered Bwere wateringcare wateringA.watered B.were watering C.are watering Why?
They __flowers when I got there.Awatered Bwere wateringcare watering
A.watered B.were watering C.are watering Why?

They __flowers when I got there.Awatered Bwere wateringcare wateringA.watered B.were watering C.are watering Why?
B
句子的意思是,当我到那里的时候他们正在浇花.
真个句子的的时态是过去式,所以是选B不是C
也就是在过去的某个时间点,我到那里的同时,他们也在浇花.所以用过去进行式

C

B.由提意判断为进行时,有因为WHEN后为过去时,所以为过去进行时。

好像有人问过这个问题过,我还回答过
可以百度一下先嘛