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        1. (2013·寧夏銀川一中高三第四次考試)________ scores of times, but he still couldn't understand it.
          A.Having explained
          B.Having been explained
          C.Though it was explained
          D.It was explained
          D
          D 考查句子結(jié)構(gòu)。本句中的but是并列連詞,由此可知but前后都是完整的分句。表轉(zhuǎn)折意義的句中,but與though不能同時(shí)用,故D項(xiàng)正確。
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