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hereactedmoreenthusiasticthandid(疑问)thosewhosemouthswerecontractedinafrown为hereactedmoreenthusiasticthandid(疑问)thosewhosemouthswerecontractedinafrown为什么用did啊?

题目详情
he reacted more enthusiastic than did(疑问) those whose mouths were contracted in a frown 为
he reacted more enthusiastic than did(疑问) those whose mouths were contracted in a frown 为什么用did啊?
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答案和解析
后面的句子是倒装了,因为主语太长,本应为those whose mouths were contracted in a frown did而前面的句子是过去时态,后面的时态要与前面保持一致啊,did代替的是reacted