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the accident was supposed _____due to careless driving

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the accident was supposed _____due to careless driving
A to happen B .to have happened
可是was supposed to have done 是过去本应该发生却没有发生?
the accident was supposed _____due to careless driving
表示“过去本应该发生却没有发生”只是to have done的其中一种用法,to have done也能表示不定式的过去时,强调事情已经发生或过去.
语言很复杂也很简单,培养语感很重要,学语法知是为了应考的.我们说中文靠的就是语感,如果靠分析语法来说中文那我们一辈子也说不好,说英语也一样.
意思是:这起事故被认为是粗心驾驶导致的.