Do sth. First, the sentence expresses that he saw the rope ladder thrown. Then three people climbed up. We know that the rope ladder is definitely not active, so we rule out AC. If you choose D, it becomes the passive voice of the present perfect tense. This sentence is inconsistent at first, followed by climbing, followed by having beentherown. 2 If you choose willcome, it is grammatically unreasonable at first. Because the whole sentence is in the past tense. Tocome is an infinitive predicative that can be translated into seeing many years later. This sentence examines the agreement between subject and predicate. In sentences with prepositions, such as with, togetherwith, the predicate verb depends on the subject rather than the part after the preposition. There are many proximity principles in English, such as As and neithernor. Mr. Li will go to Beijing for a holiday with his family. I think you wrote it wrong. It should be heisnotarrested. It means that he was neither arrested by the police nor restricted. What is used here is an inverted sentence that is neither nor. For example, I don't know or want to know. Idonotknow, nordoIcare.5 is the subject clause guided by what. It can be translated into what you call childish. I call it childish. In fact, there is not much difference between naive and naive. This question examines enough usage. When it modifies nouns, it is placed before nouns, and adjectives and adverbs are placed after nouns. First of all, this option is a bracket. It can be classified as an adverbial clause. Generally translated as anyway. Everyone knows how to distinguish their usage. This problem can be translated as no matter how small. It is correct to choose C in this sentence. Although there are many people around him, he managed to leave the usage of past participles unnoticed. Someone noticed. It can also go unnoticed. If you want to know more about grammar, you can contact me. I am an English training teacher. Pay attention to fixed usage, non-predicate verbs, subject-predicate agreement, subject clauses and adverbial clauses.