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问个英语选择题5-Why did you let Tom play computer games?-But what (

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问个英语选择题5
-Why did you let Tom play computer games?
-But what ( ) ? He won't listen to me.
A. could I do
B. must I have done
C. should I do
D. could I have done
请问,为什么选D?我知道横线上要填的意思是“我又能干些什么?”我选的是A,帮助我下.
问个英语选择题5-Why did you let Tom play computer games?-But what (
这里选择D是虚拟语气,将这句话补充完整就是But what could i have done if i had not let him play computer games?