首先第一个句子里的“but”是连词,连接的是两个成分相同的并列句子,所以选C.
第二个句子中无连词引导,表示前半句应该是整个句子里的成份,选项A和C都是非谓语动词作状语,A过去分词作状语,强调的是在主语谓语之前就已经完成的动作,重在时间先后,C则是同主语谓语一起发生的动作,没有先后之分.根据语意得知他曾经已被告知了很多次,到现在仍然不明白,故选A.
二.对比练习:1.________many times ,but he still couldn't understan
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