【选择题】We_______ school when we saw a truck coming round the corner nearby.We_______ school when we saw a truck coming round the corner nearby.A)left B) left for C)are leaving D)were leaving说下理由吧,谢谢!

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【选择题】We_______ school when we saw a truck coming round the corner nearby.
We_______ school when we saw a truck coming round the corner nearby.
A)left B) left for C)are leaving D)were leaving
说下理由吧,谢谢!

选d

用作从属连词,意为“当……的时候”,引导时间状语从句。
选D

D