选B had he changed,这是倒装句,强调yesterdan,倒回去是He had not changed change his mind until yesterday.这个句子时态要用过去完成时,所以用had.如果你要区分did和had在这类题型中的不同,建议你把2种时态的运用和表达弄清楚.
请问助动词did和had上有什么区别?
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