过去分词past participle过去完成时present perfect tense现在完成时past perfect tense限制性定语从句restrictive attributive clauses非限制性定语从句non-restrictive attributive clauses强调句emphatic sentence省略句elliptical sentence状语从句adverbial clauses倒装句inversion sentence否定句negative sentencePS.你可真算是大方的.让人家回答40个才追加10分.
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