what did he后面为什么是加used to do不是use to do

问题描述:

what did he后面为什么是加used to do不是use to do

What did he use to do...这才是正确的说法.你资料上的说法有误.
我有牛津高阶英汉双解词典第七版,上面特意说明了did后面不能写成used to.
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