8. The airport was built years ago, for some reason, it could not be used then.
英语语法与写作
章节列表
Unit 1 Basic parts of a sentence (I)30Unit 2 Basic parts of a sentence (II)15Unit 3 Modifiers: Adjectives20Unit 4 Modifiers: Adverbs39Unit 5 Modifiers: Appositives10Unit 6 Conjunctions15Unit 7 Prepositional phrases20Unit 8 Participial phrases15Unit 9 Infinitive phrases15Unit 10 Gerund and absolute phrases10Unit 11 Adjective clauses15Unit 12 Adverb clauses15Unit 13 Noun clauses: Subject clauses and predictive clauses15Unit 14 Noun clauses: Object clauses and appositive clauses15Unit 15 Sentences10期末考45