这里根据live是原形判断空里要填“过去常常”,也就是used to do的肯定或者否定形式,因为要是填be used to doing的话,句子里既没be也不是living.
看四个选项都是否定,所以就去used to的否定形式usedn‘t to,答案是B,是有答案的.
有什么疑问还可以问我,我一直在线.
I ______ live alone.A、didn't use B、usedn't to C、didn't used
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